Castle Creations has released the Mamba Micro X which is small enough for 1:18th scale vehicles. The waterproof Micro X is suitable for 2WD and 4WD vehicles weighing from 1.5 lbs up to 2.25 lbs. The Micro X has the ability to run sensored brushless motors and the programmable Auxiliary Wire allows you to make on-the-fly changes to different settings, such as torque control and max throttle.
The Mamba Micro X can be found using part# 010-0147-00. Look for a late July release with a MSRP of $89.95
To get more details check out Castle Creations Mamba Micro X .