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It's a decent deal if used, not "good" since then it would depend on the condition of the item. If it's $250 or lower for used, then I'd say it's good, but you have to keep in mind things like whether or not you're getting a full warranty, whether or not they overclocked, whether or not they take care of their shit, etc. etc.
Yes, if he's willing to give them to you. Since he's your buddy, that's usually no problem; however, for sellers online, many are unwilling to give over their receipts for some reason... (probably because of personal information left on them? No idea, but it's annoying)
Really, that's a pretty good deal even if it were used as long as it is in good shape. That's 30%+ off of retail for a card that was released less than a month ago.
I'm absolutely in love with my 7870, and I paid full price!