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Unfortunately you asked this a couple days too late, but Rogers Plus just had their 50% off clearance games sale. I saw GH: Aerosmith with the guitar controller for $30 - 50% so $15.

But if you can find it, I'm sure $30 would still be a decent price for it.

I have 4 PS2 wireless Guitar Hero 3 controllers for sell. $15 each...but I live in Vancouver

The EB at 7 & Woodbine had a crapton of them last week.

Some Walmarts sell a PS2/PS3 compatible Flying-V by TheAntCommandos for $20. I bought one months ago, I think at the Hwy 7 Woodbridge location.
XSCargo has a PS2 Aerosmith bundle with 2 guitars, I think it's $29.99. Look it up on their website. 2 guitars and the game basically.