Energizer Rechargable AAAx4 850 mah for £2.00, and also included in the 3for2 on all batteries. Good for using up some of those points earned on Boots online deals.
These are £7.48 at Tesco online (http://direct.tesco.com/q/R.100-7872.aspx) and I think just under £6 in Asda instore (sad, I know... went in hunting for cheap Smallville box sets and with cheap lemon curd on the list!)
I stumbled across these on Friday evening in an Edinburgh store (Straiton) where the reduction was shown on the shelf, and bought the last pack. I visited the Edinburgh Princes Street store yesterday and found several more packs (reduction not shown), but went through the til at £2.00 each and included in the 3for2 offer. Could well be UK wide, or just in Scotland...
It looks like these are being replaced with new 1000mah packs (£10.99 in Boots).
I previously bought Energizer AAx4 2500mah packs for £2.50 also in Boots, but these were stickered reductions, and I haven't seen them since. If you use rechargeables, it may be worth keeping your eyes open for these too. Happy hunting!!