$99.99
http://www3.towerhobbies.com/cgi-bin...?&I=LXJ583&P=7
There is also the Ultra Sport + which would make a better electric conversion:
http://www3.towerhobbies.com/cgi-bin...?&I=LXCZR8&P=7
You may also want to look at the Mustang 40 which is basically an Ultra Sport dressed up to look like a Mustang:
http://www3.towerhobbies.com/cgi-bin...&I=LXJ571&P=SM