I want to sell some bitcoins for a $500 visa or mastercard gift card (not greendot nor other reloadable debit).
That's a horrible method to try to buy bitcoins. Perhaps you got that as a gift or something and are trying to get it exchanged into bitcoins but that's going to be a tough trade.
I do know that Get-Bitcoin accepts gift card where you mail it to them and after it is successfully spent they send you the bitcoins.
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http://www.Get-Bitcoin.comHe is trying to sell his bitcoins, not buy. Reread the title.
My bitcoins (for) your visa.