or you could build your own for 10 bucks
http://www.all-battery.com/lifepo4battery.aspx
their are 3 different sizes, 800, 1100, and 2000 mah (the brown ones at the top of the list) buy 2 of them (tabs makes it easier)
then get your balancer lead http://www.all-battery.com/jst-xhv23...2cellpack.aspx
shrink wrap (fits perfectly for the 1100 batts btw) http://www.all-battery.com/34387mmshrinkwraptube.aspx

if you guys want ill explain (maybe make a vid) on how to do it....its really easy as long as u can somewhat solder.
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Always buy batteries with tabs as it is very easy to damage them when soldering. I personally have not had the need to covert to using LiPo's in the Tx or RX. I build my own packs with 2200 to 3200 mah batteries. Have not had problem with flight time with any of my TX and RX gear. One thing with using Lipo's you have to remember to turn off your equipment as if you let the voltage get too low on Lipo's you will damage them.