But should I buy the whole box? The only one Amazon has is $110 and that seems steep... should I just get the game and a couple of extensions?
It looks like they are in between printings, but everywhere I checked online says that they should be in stock shortly. CoolStuffInc has it listed for $49, which is a pretty good deal if you don't mind waiting. However, Base + I&C + T&B is probably all you would need, unless you are really into expansions.