Lots of discontinued wines in Sainsbury's to make way for a revised range.
Many now upto 75% off.
Most of the ones in my local store (Beaconsfield) were around £2-3 a bottle, originally nearly £10 each. I've stocked up for the summer, hopefully you can too!
Some of the ones I remember:
Blossom Hill Winemaker's Selection - £2.25 (was £8.99)
Lindemanns Tollana - £cheap (can't remember)
Kendermanns Pinot Grigio £2.70
Sainsbury's 10% Rose £3
...and loads more.
Prices should be nationwide but not sure how many stores will have stock as they are all discontinued products.