The lowest quote is not the lowest cost. Put every supplier on the same product configuration and trade term, then calculate freight, duty, clearance, inspection, storage and loss per saleable unit.
A tempting factory price does not tell an importer what the product will cost when it enters the warehouse. For an importer, wholesaler or brand buyer, the number that can support pricing and margin is landed unit cost.
One first order finished 22% above the pricing model
An Alibaba buyer's first-order review says the factory quote and 28-day lead time looked good. International freight later came in about 18% above plan, clearance took three extra days and produced a $400 demurrage charge, and bank fees appeared at both ends of the transfer. When the stock reached the warehouse, landed unit cost was about 22% above the original pricing model.
In the same discussion, another buyer posted a more extreme combination: $320 of goods, $649 freight and $1,039 duty. That is not a normal ratio to copy. It shows how quickly purchase price stops being the largest cost when weight, volume, classification or transport mode is wrong for the order.
The first author also promotes a tariff tool, so the post's broader claim that factory price is normally 60–70% of landed cost should not be treated as a benchmark. The useful evidence is the itemised charges and the documented 22% gap in one case.
Six company cases: buyers underestimated the costs outside the quote
Cambridge researchers surveyed 201 UK manufacturers with China-sourcing experience and examined nine sourcing projects across six companies in depth. Managers estimated that costs beyond the quoted price averaged about 25% of that price. The project-level calculation found the extra costs averaged the equivalent of 50% of the price.
| Ongoing cost item | Average share across nine projects | Range across projects |
|---|---|---|
| Product price | 65.6% | 27.3%–88.3% |
| Warehousing | 8.9% | 0–18.8% |
| International and domestic transport | 5.7% | 0–15.4% |
| Inspection | 5.4% | 0–25.0% |
| Expediting | 2.2% | 0–6.9% |
| Duty and tax | 2.0% | 0–3.7% |
The research was published in 2010 and covers UK manufacturing, not a 2026 appliance price list. Its value is not a percentage to paste into every calculation. It is evidence that the size and mix of hidden costs vary enough to make quote-only comparison unreliable.
Two missing charges can turn 20 pieces into a loss
In a separate r/smallbusiness discussion, a UK business owner said the company ordered 20 custom parts worth about £150 each. Freight and import tax were omitted before ordering, and the parts had to be sold at a loss.
An Amazon Seller Forums thread shows the same sequence: a new seller had already placed the China order before comparing EXW with DDP or selecting a freight forwarder. The community's blunt question was how a sales price had been set when import costs were still unknown.
These are not statistical samples. They identify the dangerous order of operations: place the order first, calculate cost later.
Use one landed-unit-cost formula
Start with this calculation before comparing suppliers:
Landed unit cost = (goods + packaging/OEM + origin and international freight + insurance + duty/tax + clearance/documents + inspection + banking + expected loss) ÷ saleable units
“Saleable units” matters. The MyWifeQuitHerJob operator describes negotiating a 10% lower price on handkerchiefs and receiving noticeably thinner goods because thickness was not written into the specification. For appliances, the same economic problem can appear as damaged cartons, missing accessories or the wrong plug. Cheap units that cannot be sold raise the cost of every unit that can.
Incoterms 2020 allocate transport, risk and cost obligations between parties. EXW, FOB and DDP cover different responsibilities, so supplier quotations must be compared at the same term and named place. A higher DDP quote is not automatically the higher total cost.
Use COSONIC CSC-1301 to estimate freight per unit
The current COSONIC CSC-1301 record lists 20Bar, 1350W and a 1.5L tank, plus four units per carton, 17.5kg gross weight and a carton measuring 53.5 × 64.5 × 36.5cm—about 0.126m³.
Those public figures produce useful early freight inputs: about 0.0315m³ and 4.375kg gross weight per unit before palletisation. Final chargeable weight depends on mode, carrier rules, pallets and the shipping plan, but a buyer can now obtain two independent freight estimates before paying a deposit.
Put at least these eight lines into the same RFQ table:
| Required field | CSC-1301 example or information to confirm |
|---|---|
| Product version | COSONIC CSC-1301, 20Bar, 1350W, 1.5L |
| Destination and channel | Country, retail channel, packaging and manual language |
| Electrical configuration | Destination voltage, frequency and plug; confirm by order |
| Quantity | Sample, first order and price-break quantities |
| Packaging | Four per carton; confirm OEM box, master carton and pallet changes |
| Carton data | About 0.126m³ and 17.5kg gross per carton; recheck before production |
| Trade term | Compare all suppliers at EXW Yiwu or the same named FOB port |
| After-sales allowance | Spares, missing-part replacement, warranty handling and expected loss |
CSC-1301's published carton data make freight easier to model, which is a practical reason to put it on an importer's shortlist. Voltage, plug, market documents, MOQ, lead time and final packaging still need confirmation in the quotation.
Which supplier is really cheaper?
- Remove incomparable quotes: resolve differences in version, quantity, packaging and trade term.
- Calculate landed cost per saleable unit: do not leave freight as a single total with no unit allocation.
- Test the remaining margin: allow for exchange rates, freight changes, damage and after-sales before deciding the order quantity.
The lowest factory price can still be the best price. Standard construction, efficient production and larger quantities can all reduce cost. The question is whether the buyer knows what the quote includes, what it omits and how much margin remains at the warehouse.
The cheaper supplier is not the one with the lowest first line. It is the one that delivers a lower, more predictable landed unit cost for the same saleable product.
Sources and evidence
- Cambridge total-cost study of China sourcing — six company cases and 201-company survey; old and industrial, so not a current appliance benchmark.
- First-order landed cost 22% above budget — itemised self-report with a tool-promotion conflict; one case only.
- Twenty imported parts sold at a loss — one UK small-business account.
- Amazon seller calculating import cost after ordering — real sequence problem, not a cost benchmark.
- 10% price reduction followed by thinner product — operator case with training-channel commercial context.
- ICC Incoterms 2020 Q&A — authoritative responsibility boundaries, not product-quality evidence.
Importer questions
Is DDP always easier and therefore cheaper?
It can be easier, but the total depends on what the quote includes and who controls clearance, documents and delivery. Compare the same named destination and ask for exclusions in writing.
Should I use a fixed percentage for hidden costs?
No. Use actual freight quotes, tariff treatment, local charges, inspection and loss assumptions for the order. Historical percentages are warnings, not calculators.
Why divide by saleable units rather than ordered units?
Because damaged, missing or unsellable units still consume purchase and logistics cost. Margin comes from the units that can actually be sold.
