[Pepper Jack]

i cant help you with the bestbuy thing, but adding another controller is simple. just do the same thing as you did to add your original wireless controller

incase you forgot i think you just press the little button on the xbox next to the memory card slots below the disk tray and press the other little circular button on the top end of the controller just about where the battery pack goes, and they should find eachother (whether u have to press the xbox button on your controller first to turn it on i dont remember but i think you do have to)