Update: Buy.com said they will accept copy of the UPC for the $10 buy.com rebate.
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Buy.com has a Gigafast 5-Port 10/100 Switch for FREE after $20 rebate and $10 rebate (Copy of UPC) with Free Shipping. Both require Original UPC, however, you can try a copy of the UPC for the $10 rebate and print out the Buy.com page with the $0.00 price and send that also. Leave a note along with the rebate.