Go to Walmart and buy a high priced item using my gyft gift card (paid for with bitcoins) which gives me a 3% discount.
Return the item and get 100% cash back.
Then use that cash to buy bitcoins on Bitstamp driving the price UP!
rinse and repeat
Wait a second. Does that actually work? You can arbitrage using the Gyft loyalty discount? That's pretty funny.
a lot of high price items have restocking fees.. you can get by a few times but this idea isn't going to make my much hay
and many times they will just make you keep store credit
even still.. 3% on a $2000 item is a whole $60.. unless you know someone who works there, or work there yourself, you won't be able to grind that many times