Tamiya offers several TT-01E kits that are RTR. These kits come assembled, include a transmitter, receiver, brushed speed control, motor (540 silvercan), a painted body, and wheels. You will need to provide AA batteries for the transmitter, a 6-cell nihm or 2s lipo battery to power the car, and a charger to recharge the battery. You may also need to buy different wheels if you are racing and additional pinion/spur gears to get the appropriate speed for the track you may be running at.
Here are some RTR options available on TowerHobbies (http://www3.towerhobbies.com/cgi-bin...VSEARCH=tt-01e
The TT-01 is not a hard kit to assemble and it includes easy to follow instructions.