The Eneloop pre-charged rechargeables are back down in price at 7dayshop.
"Eneloop batteries come pre-charged and ready to use and maintain/hold their charge for a very long time and compared with normal Ni-Mh batteries. Eneloop AA batteries are rechargeable up to 1,000 times and are capacity rated at 2000mAh and will offer you excellent performance. "
There are other non-branded (or less well known at least) alternatives for similar prices and less, and some say better, but many swear by these.
Its 7dayshop, so currently "Stock: Plenty"! The price of these had gone back up to nearly £8 recently.