Easy why dont you just buy off a sliding scale?
Example. Customer ships you 1000 pounds of ewaste. You agree to buy @ 3.50 per pound at current market value, but reserve the right to be lower or higher if the price of precious metals changes. You send a document to the customer showing that for every $25 gold drops or increases then the purchase price will be +/- 0.10.
The product reaches you after 7 days. Gold increased by $50 so the customer gets a nice bonus of his items being worth 0.20 per pound more. Or if it dropped by $50 then the client would already know they would be receiving 0.20 less per pound and it wouldn't be such a shock.
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