Ran across this web site. It has some neat surplus parts.
rgordon
USA
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Dual Hbridge W/PWM
— Dual H-Bridge w/PWM movement panel: control two DC motors' direction and speed via EZ-B PWM for responsive forward/reverse/turning.
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I love going to American supply and surplus! Its a truly wonderful place to visit. I could spend a whole day there! I have one about 20 minutes from my house. You never know what you'll find their.
Oh wow....I wish there was one close by here. I'd be there constantly.