Here is a 4WD off-road RC robot car with Bluetooth control that can be programmed using a graphical interface. The Xiaomi Mitu comes with 3D visuals, so you can easily put it together. This robot car features a digital servo that supports a rotation range of +/- 160 degrees. It has a 4-wheel steering and independent suspension system.
The Mitu YYSQC01IQ robot car runs on a 1650m Lipo battery. It is available for under $175 at this time.