Reply if you can help and we can talk.
You might want to move this to the Digital Goods section of the forum, see https://bitcointalk.org/index.php?board=93.0
There's already a couple of amazon gift card sellers on the first page that have exactly rates you're looking for, see https://bitcointalksearch.org/topic/wts-amazoncom-egiftcards-steam-digital-giftcards-4629260.
However i am afraid that most of these guys, ( including the link i referenced to above, so be aware!) are scammers. I'd advise you to not buy from any autobuyer links, and never do a deal without escrow, ( Also 500$ at once with one buyer? it might be smarter to do several smallers deals, that will severely lower the risk of you getting scammed!)
