I guess I'm cheap in some ways - just the other day I bought a few packs of AA eneloop's @ Costco... part of the reason is each pack came with a couple battery case's. Each holds 4 AA cells.
10 AA's per pack for about $20.
They also had a 8-pack mix AA & AAA plus Sanyo 4-bay charger and a couple slip in C & D cheaters, on sale for only a few bucks more. But the 10-pack AA with the cases, well I guess I thought at the time I could use a few cases so I spent almost the same (few bucks less) so I can have the cases. They are cheap cases, but I didn't have any cases at all just a week ago. I also just bought the i4 charger earlier this month, plus already had a Sanyo 4-bay charger from previous eneloop purchases. Maybe the other package was a better deal being on sale, but cheap cases got the better of me.