No, i'm not selling up. I just saw this and am once again relieved that my chair has arms and that I wasn't drinking coffee at the time.
http://www.ebuyer.com/search/?intStoreID=74&intCatID=265&intSubcatUID=2180
Cheap enogh to smash? Probably. Cheap enough to buy on a whim? Definately? Slave labour involved? Most likely. Going to make you a rock star over night? Probably not. An alternative to Guitar Hero? I guess it depends on your natural ability, patience, and whether you'd rather drunkenly hammer out unrehearsed nirvana covers or want to believe you are the next Kirk Hammett.
