If you're looking for a good price comparison website, you should try www.pocketdeal.com. They post every day with the latest deals, and their onine price comparison tool helps you compare yourself prices!
Another good price comparison website is www.priceant.com. Same as the one before, you type in the product you're searching, and their tool will return al their hits. This way you can choose which store comforts your needs. For example you can see bing cashback, and maybe get better prices than the ones listed there. I hope this helps. Good luck.