Checklist: deciding whether a used price is fair

Before making an offer:

1. verify that the listing describes the exact version you are looking for;
2. compare several prices and, where available, completed sales;
3. check cosmetic and functional condition;
4. assess modifications, repairs, originality and missing accessories;
5. consider new-product availability and equivalent alternatives;
6. add shipping, insurance and foreseeable maintenance;
7. increase your safety margin when data is scarce or a fault is undiagnosed;
8. set your maximum price before negotiating.

A price is attractive only if it remains sensible after all these checks. The discount from the seller's asking price is not a measure of value; the real market comparison is what matters.