I don't like disagreeing with Red either - but I think it's fine to assemble ones own packs as long as a guy takes the time to learn/do it right.
I'm with Deadeye - the Energizer NiMH make very good TX and RX packs. I buy the 2300 mah NiMH AA 8 pack at WalMart for $17.87. High capacity packs for a very good price.
ORIGINAL: Swager
Where can you just buy the connection wires and plug at?
I've heard Radio Shack has braid for putting cells together. [link=http://radicalrc.com]RadicalRC[/link] has connectors, leads, cell tabs, and cell shrink wrap. Your local hobby store probably has a battery lead with connector also.
Here's some very good info on making your own NiMH packs.
[link=http://members.aol.com/davthacker/nimhfaq.htm#Your%20New%20Battery]Your New Battery Pack[/link]
And Dave's [link=http://members.aol.com/davthacker/cellsoldering.htm]Cell Soldering Help Page[/link] - which MinnFlyer pretty well summed up.