If you bought wii sports resort on Argos for the 20% off voucher like i did and have two controllers - you'll probably be looking for another cheap wii motion plus.
Although it is not currently in stock - if you don't mind wiating. Estimated delivery on mine says: 06/08/2009. Then this is a good deal.
discount coupon for £14.73 price is HUT10
and i guess even better deal for MoreThan customers