Just got back from Asda and there's a load of new wines added to their frequent 3 for £10 offer. The best saving is 3 Banrock Station Reserve chardonnay verdelho which normally retails at £8.91 - so normally £26.73 for three.
Loads of different reds, whites and rose available.
Full list of available wines if you follow the link.
Then scroll down to "beers, wines and spirits" and then near the bottom is the direct link marked "Wine 3 For £10 (8/12/2008)"