RC ESC 20A Brushed motor speed controller already available at the store online, ESC 20A
This price is affordable.
esc 20a brushed can for rc car , rc boat , or rc tank and others
esc 20a can operate in voltage 3V to 9.4V

Main features :
Function : forward, reverse, brake
working voltage : 3.0V -- 9.4V
Dimensions : 35 X 22 X 6 mm
current : 20A
Driver frequency : 2KHz
Input : Li-po 2S / Ni-Mh /Ni-cd 4-7cell
constant current 20A Max 25A -- 30s pulsed 50A -- 5s
usage for 130/180/260/280/380 brush motor