Target and Wal-Mart have them for about 9-10 bucks. Best Buy has them for a couple bucks more I think. I think the only brand I've seen is Energizer and I've had no issues. In an emergency I bought a Radio Shack brand from RS for about 14 bucks. It seem to last as long as Energizer.


Buy 2 at a time. They die without warning and it can be embarrassing to have one go dead in the middle of a shoot and not have a back up.