guitar hero III controller

does anyone know if you can buy a seperate guitar for it or do you have to buy the bundle. because i would like to have 2 guitars. or does anyone know if they arent if and when they will be avalible? (PS3 guitar)

http://www.play-asia.com/paOS-13-71-zn-77-3-49-en-15-guitar+hero+3-70-2gcb-43-bm.html

Here's one, I'm pretty sure it will work, but it's kind of expensive. I hope these are the ones coming out next year. Not the regular ones