GP - Gold Peak Batteries
The Battery Station - (buy the cells and build your own packs!
The RC Battery Clinic - (battery information)
SR Batteries.com
LarryFlew.com - (good battery packs, you add your connectors.)
ASpencer1 - (another good source)
Rayovac 9V NIMH wired in parallel with detachable Radioshack 9V connectors and shrink wrapped (300mAH at 8.4V)! Sears is selling them in a 2 pack for $9.99 marketing them as Diehard! They work great!!!