First, go here and check if this game is available for you for local pick up. The game is $19.99 (Or $17.99 for best buy gamers club unlocked members):
At the time of this post, amazon is giving $30 trade in credit for the PS3 version of the game. Make sure it's still the case by clicking here, selecvting the ps3 version (then page defaults to 360) and verifying the trade in value on the right side of the page:
If both things are good, submit your amazon trade immediately (This won't last long) and lock it in. When you submit the $30 trade, amazon will mention they will give you an extra $30 credit if you use it towards a dualshock 4 controller. Basically, what it says in this promotion:
Once your trade is locked, buy the best buy game. Local pick up is preferred, but if there's none available in your area, you might want to try your luck with shipping. Do lock your amazon trade first thou.
You don't need to trade a guitar or any accesories with the game. The game is simply called "Guitar and bass". That doesn't mean it includes a guitar or a bass. Just that it's a game that teaches you to play......guitar and bass.
Be mindful of other fellow CAGs who also might want to get an extra dualshock 4 for themselves, and don't be a d-bag and sumbit 100 rocksmith trades while wiping all best buys of any stock of the game. Just don't abuse it. We can be civil and do our best so in Jack Tretton's words, "Everyone who wants one, gets one" ok?