I quite like Bid & Pricedrop TV...
Bought a 1350w steamer from them the other week for 24.98 incl p&p = brilliant machine, and I can't find anything similar for less than £60. Some of their products are genuine bargains - you can do web checks to see what prices places like Tesco, Argos, Amazon etc are selling similar items for. You just need to factor in the cost of P&P and the phone call to decide whether it's a real bargain or not.