I frankly hope nobody who wants the game goes to Gametap. You don't have the box and manual which came with the title, offering both useful content and some nostalgia value. (I've still got mine.) You can't play away from the Web, so if you're server goes down, or you're in transit without a network, sucks to be you.
If Gametap itself ever goes down, again, you're stuck, even if you have Web access.
My point: you don't really own a singleplayer game it if you don't have in your hands to play when and where you wish. For the little it costs when you search for it elsewhere, I'd suggest buying a full copy of PS:T.