Bargain wine buying

An option for those that want to get more bang for their buck !

Tesco's have a scheme called 'Double Up'

http://www.tesco.com/clubcard/clubcard/doubleup/

this allows you to trade in your Clubcard vouchers at a 1:2 rate for vouchers to spend in their online wine shop

http://www.tesco.com/winestore/

For 50 in Clubcard Vouchers you get ã100 in Double Up vouchers to spend online, if you spend over 99 you get the ã5 delivery refunded and if you're selective about what you buy you can make even bigger savings - some of the Specials are half price .....

http://www.tesco.com/winestore/controller.aspx?more=y&catTitle=Special%20offers&Ns=Price+per+Bottle%7c0&N=70032&Nr=70002

Anybody got any other suggestions for saving money on wine ?