10A+ DPDT relays will reverse direction (occasionally and not quickly; probably fine for fwd/reverse.) It's probably a toss-up whether that would work out cheaper than a "real" H-bridge...
I have completed that using tamyia TEU-101BK controller, which is just 4 MOSFETs and it even supports PWM. It is a little bit expensive (30$), but I have it from RC car I am hacking, so why not?
I meant that a DPDT relay would add "reverse" to a conventional single-direction speed controller...
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