If you're selling the cards for less, than an actual store, you're not going to be making a profit. Depending on the delivery, it'd probably be worth just spending 5-10$ more on a card at a near by store, instead of a waiting game.
Why do this if you're not making a profit? You're losing money out of it, lol. =/
Also - you can't call his site a 'Scam' site, unless you actually purchased an item from there..