I have a rarely used Canon BG-E2. I used it on a vacation several years ago and maybe 3 or 4 occasions since then. Works well with no problems, and the AA battery magazine works without problem too. (I used the battery magazine on vacation overseas when I found myself without the proper outlet adapter. very handy) I also note that this is the original BGM-E2 that came packaged with the battery grip, so there is no issue of incompatibility. I no longer have the original packaging, so the price is discounted accordingly.
Price (battery magazine included): $55. that's $40 + $10 for shipping within CONUS/paypal.