I think I paid $16 for my GP 2100's. I like them alot. Like I said the seem to last 3-4 sesions, but being Nickel Medal-Hydride I charge them ebout every othe time. Once or twice a week depending on the weather. Any of the recharchable AA's would be a good investment, but you do have to buy a JR charger, if they sell them, or a JR polarity reverser to go with a standard charger.
Unless you had a Radioshack X-Mod charger. I've head they do excellant charging Rx AA's, but for a Tx that means twice as long for 8 instead of 4, and in two differant sessions, so for the Tx you whant a changer. I have a cheap Futaba one that with the JR reversing adapter will charge the Tx, and the rechagable Rx pack at the same time. Granted it take 4-6 Hrs, but it only cost about $25 buck if I remember right.