In the past I bought some 2300mah Panasonic NiMH batts from Costco with a charger. Then I found some 2500mah NiMH Evereadys.
This past w/e I found some (4 x AA) 1.25v NiMH with a universal charger at WalMart for about $17. The charger (which can also charge AAAs) comes with an adapter for an auto (cigarette lighter), and a wall wart which accepts 100v-240v and a European adapter. So you can charge the batts anywhere. The batteries have no brand and are made in China. They had just the batts (AA) 4 for $6.99.
Note that my scanners work great on any of these batts, but my digital camera does not like the typical 1.2v NiMH. The camera works good with these 1.25v NiMH.