Try the usual i.e. Play, Shopto, Game etc.... Could be looking at around £200 with xtra controllers & maybe an another game.
TBH I would save ya money as I have just sold mine to my antie for £100 (just basic package with Wii Sports), after owning it for just over 2 years with very little use. Its good for when people come round, but mine was gathering loads a dust as I was on the 360 most of the time. Although, if you have small kids its pretty fun though:approve:.