Cheap Drive ESC

[Rapidrory]

These are the cheap 20A ones without brakes on the website i found: http://www.dx.com/p/jxh-xys-bl20a-20...8#.U6dNDvldWSo

Though I find a robot without ESC braking can be tricky to control, as it carries on moving when you release the sticks.

EDIT: Also, motor braking shouldn't affect that ESC, as it's way over rated for the a BW motor so should be able to handle any amount of stick waving, brakes or no.