Hey, i came across this earlier... I dont even know what brought me to it, but anyway, its how to build a lipo charger for just a few bucks, and some electrical skill. Cheap enough for the cheapest of people! It doesn't balance, per se, but it charges each cell indevidually to 4.2v, so in the end they are balanced!
http://www.wattflyer.com/forums/showthread.php?t=20575
always works as a backup charger too!