Oh you're loving kidding me, the sale ended a few minutes ago. I would of had it too if it wasn't for this stuffty no-steam game policy. I can't believe it I had all 3 packs in the cart for 5 dollars and now it's just 15.
Buy the GOTY edition from Steam or pay the full price of the DLC.
NO, especially when the sale has ended.
This is why I think PC elitism is bullstuff, I wouldn't have these problems on the PS3.