If, for some reason, you suddenly find yourself both in need of an extra Wii Guitar Hero controller and a little light on cash -- no idea what could put so many people in such a state at this particular time -- you may be interested in today's Amazon Deal of the Day.
For $25.98 (just enough to qualify for free shipping!), the retailer is offering the Nyko Frontman guitar controller in either white or yellow. Both include interchangeable pickguards for a bit of customization. Of course, this guitar was originally designed for Guitar Hero III, and consequently does not feature the freaky touch pad business that the newer World Tour guitars do. But as a second guitar (or a bass) it should be fine.