Couldn't resist this OTA, 102mm fl=800mm which cost me £20 ($25 ?).
When it arrived it looked as if it had led a hard life accompanying a painter and decorator maybe as it was covered in paint spots/splashes and a few scratches here and there. However the objective looked near perfect.
So I bolted on a dovetail and 6x30 finder that I had laying around and try it out. True to form the focuser was absolutely appalling with a couple of mm of slop and a kind of 'digital' plastic rack and pinion that moved in steps not continuously! As a solution I added a strip of plastic to act as a shim and double my investment by purchasing one of those little 1 1/4" fitting helical focusers.
Not star tested it yet but terrestrial images look very nice so overall I'm pleased with the outcome!