In Exeter Alphington Sainsbury's today, they had a selection of boxes of 6 x 75cl bottles of wine reduced to £12.
The one I bought was called Ripe & Juicy Red Wines and contained 2 x Castillo de Calatrava Gran Reserve 1996, 2 x Zontes Footstep Cabernet Malbec 2004 and 2 x Rosabrook Cabernet Sauvignon. The box lists these bottles as £9.99, £8.99 and £9.99 respectively and shows that the original selling price of £29.94 represented a saving of £28.00. Therefore, while I'm no wine buff, £2 a bottle seems a real bargain, especially when they do actually sell the Castillo de Calatrava Gran Reserve 1996 for £9.99 a bottle online.
It was such a bargain that the sales assistant refused to believe the price it scanned at, so called over a supervisor who went off and confirmed the price. I don't know if this is in other stores, but there was a big display in this store which included white wines and wines for entertaining. That said, they were going quick.