Shopping online is becoming more and more popular.
http://news.bbc.co.uk/1/hi/business/2372577.stm
There are many price comparison websites to help online shoppers to save money. The most famous one is moneysupermarket.
One of my customers has a website called poundpig.com
http://www.poundpig.com
Members of the website can get cash back if they shop via the website. Membership is free. On registeration you will get £2.50 of credit immediately. So give it a try!
and if you refer a friend to the poundpig.com site, you will get £7.00