I want to buy an XFX PSU on newegg, and they have a 15 dollar mail in rebate. I do not really know how to get that 15 dollars. Where do i get the invoice number, or do i buy it and then they send me the gift card?
Usually you have to download the form and fill it out and usually have to send in the UPC bar code. The invoice number is given to you when you place the order at Newegg.com.
I usually check Amazon.com when I find something on Newegg to compare prices. Also, Amazon often gives an instant rebate where you don't have to do a thing. So often, when Newegg has a rebate for an item, the Amazon price has already subtracted the value of the rebate and thus lowered the price.