Scroll about halfway down this page for a few cheap ubecs $10-15 ea
http://home.comcast.net/~truerc/esc/escNmotor.htm
I have two of the $12 ones there... no problems with them. I also have a Kookflight from RCM, and another $15 one from somewhere?
Jammin CRT MM/Neu 1515 1700kv
Losi 8IGHT MM/Neu 1512 1900kv
Kyosho 777
T4 MM 5700
B4 LRP
XX4 MM 7700
old losi xxcr, MM4600 4s lipo 70mph+