I have bid on 2 different 201-3 machines on shopgoodwill, one recently. They went for way over my price (because I don't NEED any more), more than $150. They had a solid hand wheel, but of a bigger diameter than the 201-2 (of which I have two), so should fit a 66 size treadle if the belt groove is big enough.
I wondered if the raves for the 201 was just hype, but when I used my cheap ($10) 201 to piece some quilt squares I was hooked! None of my other machines are as quiet, not even my handcranks! It is in the top 5 list of keeper machines if I have to seriously downsize. Too heavy to grab in case of evacuation though (always at the back of my mind here in california).