Price comparison sites - they've been with us for as long as we can remember and they're still going strong. If you want to find the cheapest prices on product XYZ simply dial up your favourite comparison site, plug the product name into the search bar and, 'Hey, presto!' - you get a selection of the best deals on the web.

More recently, the search engines like Google have been getting into the market but there are still plenty of the old names kicking around and, to be honest, I find them more useful and relevant than some of the newer comparison sites.

Kelkoo is one of the oldest and best known price comparison sites on the web. Still supplying some great deals and I highly recommend them. 5 out of 5 marks.

PriceRunner was recommended to me by a friend. It's ok but I guess I'm just a sucker for a Kelkoo deal! Personally, I find the navigation on Kelkoo far easier to use than PriceRunner's! 3.5 out of 5 marks.