Purchasing a product with different cost prices for distribution through different channels.

All, hope you can offer some advise please

I have a scenario where we need to purchase a product with 2 different costs based on different distribution channels.

We want to track the correct sales margins for each purchase and sale, and therefore don't want the the 2 purchase costs to be averaged at time of receival of the stock

example

Purchase product x @ $10 and sell for $20

Purchase same product x @ $15 and sell for $25

Any suggestions would be greatly appreciated

Best regards

Graham