Kelkoo.co.uk - features a large number of categories including books, CDs, travel, computing and electronics (Kelkoo also run Shopgenie).
Shopping.com UK - offer millions of products from thousands of merchants, in a large number of categories, from appliances, through music to jewellery.
Pricerunner UK - a leading European price comparison website, provides the most comprehensive service in the UK market, listing over 2.6 million prices from over 4,000 retailers
Ciao.co.uk - Over 2,000,000 consumer reviews, plus price comparisons and product ratings, for informed buying decisions
Google's Product Search - (previously known as Froogle), with ordering by price and breakdown by category.
Lycos UK Shopping - compare prices and products from a catalogue of 400 merchants and over 3 million offers in many different categories.
Pricegrabber UK - Find the best deal on by comparing bottom-line prices, including tax and shipping at PriceGrabber.com. Read real customers reviews on as well as online merchants.
Nextag UK - a Real Time Price Comparison Shopping Engine, Finds You the Lowest Prices on the Web for Computers, Electronics, Books, Music, Movies and More.
prices.zdnet.co.uk - PC goods, digital cameras and camcorders.
Shopzilla.co.uk - Cheap prices and huge discounts at Shopzilla UK. Shop for your favourite brands, products and gadgets. Find bargains at the best UK shops - covers a wide range of categories, from clothing to video games and cosmetics.
Abcaz.co.uk - Compares high street shop prices in a large number of categories.
MSN shopping UK - combines the comparison results taken from both Shopping.com UK and Pricerunner UK
Zencudo.co.uk - UK shopping search engine for price comparison, sales, discounts and promotions
Foundem.com - price comparison and travel search engine that finds cheap airline tickets, discount hotels, car rentals, books, dvds, and more
Twenga.co.uk - Giving you the broadest choice of products and retailers and the tools to guide you to the right decisions : Over 5,000 retailers, more than 6,000 product categories, extensive listing of brands, detailed user & expert product reviews, instant price alerts.
Jellydeal.co.uk - we compare the lowest prices on thousands of products from the UK and have impartial reviews. We search all leading online retailers for the latest deals and prices.
Pricecomparison.co.uk - price comparison shopping engine; product search, pricing guide, compare shop stores, bargains, deals, rebates, coupons, reviews & ratings.
Find-dvd.co.uk - Compare DVD prices from dozens of UK retailers, DVD, CD and videogame comparisons.
123PriceCheck - Buy cheap books dvds CDs and games. Free price comparison of UK based online shops.
Priceguideuk.com - At the Price Guide UK you can compare the prices of virtually anything from hundreds of suppliers. Categories include computers, consumer electronics, DVDs, books and travel.
Pricechecker.co.uk - The UK's price comparison site finds the best prices from the UK's premier suppliers for FREE! Includes music, games, finance and computer categories.
Onlinepriceguide.co.uk - Compare prices for Books, Music CDs, DVDs and more with Online Price Guide price comparisons
Price Clash - a shopping comparison site allowing you compare prices and stock availability on dvds, videos, music, books and games from leading internet merchants.
Amazon.co.uk - not often thought of as a comparison site, but features prices from many other retailers alongside its own.

If you know about a service/site that you've found useful and think more people should know about it, let us know via our feedback form and we'll find out if we can include it here. We have tried to include a variety of opportunities for you to either make money, save money, or make what you do a little bit easier - but we certainly would welcome more!