If it is too good to be true...
I don't think it is worth the few dollars you would likely save. If you ARE going to do it, I would make sure the person has very high feedback percentage and number, then use PayPal, etc., so that you have some protection in case it is fraudulent.
I heard on the news that up to 85% of giftcards on eBay are stolen, fake, or otherwise obtained illegitimately.
fuzz