Here's a fast deal on AA and AAA batteries!
Today only (3/12), Woot offers 24 AAA + 8 AAA batteries for a low $5.99. You get Woot's flat rate shipping for $5 more. You can add additional battery sets and still pay that same low $5 shipping price for your whole order.
These batteries are not top of the line, but will work fine in everyday electronics.