Motor controllers for a newbie

Hi, I am a newbie who is trying to build a homemade robot and I need some PWM motor controllers and I can’t find any for a good price. Would anybody at the FRC VABLA competition in Blacksburg and have old pwm motor controllers that I could either have or buy for a lower price? I can only do it in person. Thank you!

What is your price range?

15-30 per controller