Can I buy Guitar Hero 3 but without the controller (guitar itself)?

Yeh they do, just go to where all the other games are and you will see it in a normal case, costs the same as a normal game

placed guitar hero 3 with controller, a on the spot controller, and % for velocity maximum needed on ebay and ill purchase that for like... a hundred and fifty$ on the grounds that its all used yet yeah seperate is a thank you to pass because of the fact human beings might % a million pastime or some issues right here and there, and that they dont % extras

Yes, and your GH2 controller will work perfectly with your new game. :)

If you are used to the Guitar Hero 2 controller, you'll be fine!

~Smell

No. When you see the game separate on the shelf, its only a display. You must buy the guitar also.

yes they do but i personally like gh3;s guitar smaller easy to handle but they sell fro like 50 to 60 bucks

Yes you can buy it by itself at any game retailer