RC Cars come in a wide variety of prices. It depends on what you want. If you want a cheap RC car, you will have to opt for a toy-grade RC car. If you want an expensive RC car, you will have to opt for a hobby-grade RC car.
There are many cheap RC cars that you can buy, but the cheapest RC cars are the ones that are sold without the remote control. You can still buy the remote control separately, but the RC cars without the remote control are generally cheaper.