ORIGINAL: Walt and Sage
Tom at Wild Hare has a nice A123 starter package:
A123 battery starter kit
We now have a nice kit to get you started with the A123 battery technology. The kit includes 1 2500mah battery pack (sufficient to properly power any R/C aircraft, really), a Cellpro 4S charger, charge cord to connect to the battery pack or any charge jack, and one Smart Fly super switch
GO TO:
http://www.wildharerc.com/html/specials.html
Walt...
Be careful they may not be genuine A123s to the best of my knowledge (although I may be wrong), A123s only come in 1100 and 2300mAH capacities. It's either *not* a true A123 or they're overstating the capacity. Either way, this does not appear to be particularly ethical.
Check [link=http://www.a123systems.com/products]the A123 Systems website[/link] for more info.