Update:
I just verified that hperry is correct, the +1 trick no longer works. But if you have multiple GMail accounts (which is easy), you can still sign up with them and still get an additional $10 off per purchase. (Verified with another one of my accounts)
Also, it seems
www.buy.com removed the free shipping option (bastards!), so now the total price of the card is $7.62 . Still not bad, but not as sweet as the deal I got earlier!
~Journey