Lists of price comparison services

Global

Flights

• http://www.skyscanner.net - searches 1,000+ airlines for best deals

Hotels

• http://directrooms.com - meta search engine for hotel accomondation. Scans 250+ hotel booking sites for best rate on given hotel.
• http://www.trivago.com - meta search engine for hotel accomondation. Scans 130+ hotel booking sites for best rate on given hotel.

Shopping services by traditional search engines

• http://www.bing.com/shopping seems to be discontinued
• http://www.google.com/shopping
• http://shopping.yahoo.com/

Australia

• http://www.getprice.com.au/
• http://www.myshopping.com.au/
• http://www.shopbot.com.au/

New Zealand

• http://pricespy.co.nz/

Europe

Finland

• http://www.vertaa.fi - mostly electronics price comparisons but also other fields

UK

• http://www.beatthatquote.com/ - specializes in personal finance products
• http://www.kelkoo.co.uk/
• http://www.mysupermarket.co.uk - View prices and shop in w:Asda, w:Sainsbury's, w:Tesco, Whiterose and Oscado
• http://www.pricechecker.co.uk/
• http://www.pricerunner.co.uk/
• http://uk.shopping.com/ - by Ebay
• http://www.ukpower.co.uk/ - compare all enrgy providers in the UK
• http://www.uswitch.com/ - The site handles gas, electricity, water, home telephone, broadband, digital television, mobile phones, personal finance products, heating cover and car insurance, with a number of new markets in the pipeline.

North America

Canada

• http://www.shopbot.ca/

USA

• http://www.become.com/ - electronics, home, garden, computers, cameras, clothing, health, beauty and more
• http://www.bizrate.com/
• http://shopper.cnet.com/ - by cnet
• http://www.nextag.com/
• http://www.pcworld.com/shopping/ - computers etc. by PCWorld
• http://www.pricegrabber.com/