Found in my local (South Wales) ASDA
The following have been discontinued and therefore on brilliant deals.
Bollinger Grand Annee 1996 (Best vintage in years) + 1997 vintage - Only £25
(Wine Rack price £59.98 for the 1999 Vintage)
Laurent Perrier NV - Only £10.74
(Wine Rack price £44.99 - when you buy 3 only £29.99 each)
Iv also heared on the grape vine theres more deals on the way including Pol Roger Vintage.
If there's any of the above in your local store please let me know id love to be able to get hold of more.