Looking to rehab my buddy

My friend shattered the head of his tibia in January. He can now start to put weight on the leg. He has no insurance so can't do rehab treatments per se. The doctor told him he can pedal now.

Does anyone have an old stationary bike or a trainer to get him started? cheap or borrow would be best, not sure he's got much cash till he can start working again. He's a self employed heavy equipment operator.