How to Compare Display Supplier Quotes When the Specifications Do Not Match

Two quotations for the same display rarely describe the same product. One includes bonding and a coated front, the other does not; one prices at a prototype quantity, the other at production; one lists tooling separately and the other has it built in. Comparing the totals is meaningless until the offers are normalised.

Part of the Custom Displays, Sourcing & Manufacturing guide — 46 articles on tooling, sampling, MOQ and supply-chain risk.

Why the totals are not comparable

Four differences account for most of it.

The quantity basis differs, because a prototype price and a production price are different products commercially. The scope differs, because one quotation may include the front assembly, coating, touch and bonding while another covers only the module. The tooling treatment differs, because some suppliers amortise tooling into the unit price and others charge it separately. And the terms differ, because freight, duty and payment structure land in different places.

Normalising means making all four explicit before comparing anything. A spreadsheet with one column per quotation and one row per characteristic turns an argument into a list of differences.

The normalisation table

Compare line by line, then total.

Quote comparison structure

Row	What to record
Panel	Size, resolution, brightness, temperature range, panel source if disclosed
Touch	Technology, glass thickness, controller, glove tuning
Front assembly	Glass type and thickness, coatings, print, bonding method
Interface	Type, connector, cable length, controller board inclusion
Sealing and mechanical	Sealing method, mounting features, gasket, hardware
Tooling	Items, one-time cost, amortisation basis, ownership
Quantity basis	Quantity at which the price applies, annual volume assumed
Commercial	MOQ, lead time, payment terms, warranty, Incoterms
Documentation	Verification reports, material declarations, traceability, change notification

Filling this table usually shows that one quotation is cheaper because it omits a requirement, which is a different statement from being cheaper for the same product.

Pricing the differences

Convert gaps into money.

Where one quotation includes bonding and another does not, the difference can be estimated from the bonding line item in the first offer, or established by asking the second supplier what the option would cost. Where one includes a controller board and the other expects the buyer to provide one, the board’s cost belongs in the comparison. Where one includes verification reports and the other does not, the cost of commissioning those tests separately is a real difference, not a documentation detail.

After pricing the differences, the comparison becomes a like-for-like figure at a defined quantity, with the remaining differences listed as risks rather than costs.

Comparing at the right quantity

One price point is not enough.

A quotation is only valid at its stated quantity, so the comparison should be made at the quantity the buyer will actually order – typically the first production order and the expected annual volume. Where the volumes differ between offers, ask each supplier for both points. The shape of the price curve matters as well: a supplier whose price falls steeply with volume may be more attractive for a growing product, while one whose price is flat may be better for a stable, low-volume product.

Asking for two or three quantity bands, with the tooling assumptions stated for each, makes the comparison robust and gives the buyer the information for a volume decision later.

Evaluating what is not in the price

The difference often lies outside the quotation.

• Supply continuity and the discontinuation notice commitment.
• Change notification practice and whether it covers materials and site.
• Traceability and the ability to reconstruct a lot’s history.
• Responsiveness during a quality issue and the 8D process.
• Engineering support during integration and its cost.
• Documentation quality, including drawings and verification data.

None of these appear on a price list, and several determine whether the product reaches production on schedule. Where the difference in price is small, these factors are usually decisive. Certificate scope for a supplier can be verified through an accreditation register, as described by the International Accreditation Forum, and the cost of commissioning verification testing separately is available from laboratories such as Intertek.

Questions that reveal the real offer

Six questions, asked of every supplier.

1. What exactly is included in this price, item by item?
2. What is the quantity basis, and what is the price at double and half that quantity?
3. Which tooling items exist, and are they one-time or recurring on a design change?
4. What verification and material documentation is included?
5. What are the lead time components for a repeat order?
6. What happens to the price if the specification changes after the order?

The answers usually convert a set of incompatible quotations into two or three comparable options, which is what makes a decision possible.

A worked comparison

An example of the method.

Suppose quotation A covers the module only at a prototype quantity with tooling separate, and quotation B covers the module plus bonded coated front and a controller board at a production quantity with tooling amortised. Normalising means adding the front assembly and board to A, converting both to the same quantity, separating the amortised tooling from B’s unit price, and listing the documentation items each includes. Only then does the comparison produce a decision; before that, it produces two numbers that cannot be subtracted.

Recording the normalisation in the supplier file means the same exercise is faster next time and shows each supplier what they were compared against – which occasionally produces a better offer on its own.

Documenting the decision

Record why, not only which.

The decision record should state the normalised prices, the differences that were priced, the risks that were accepted, and the reason the chosen supplier was selected. That record is valuable when the product’s cost is questioned, when a supplier underperforms, or when the same decision has to be made again for a successor product. It also protects the buyer personally, which is not the primary purpose but is worth noting.

Where the decision involves a regulated product, the documentation and change notification capabilities carry more weight than the unit price, and the record should say so explicitly rather than leaving the choice looking arbitrary.