I have seen guys sell them for about 400-500 complete with everything one them from air cleaner to oil pan and even the clutch. This means a turn key setup with the water pump, carb and fuel pump etc. That is in nice condition. If its just running then it won't get that much. The idea of the news paper in the video would be good.
I sold my 3 speed for 150 bucks and the non running 200 for 150 bucks. So, I got 300 for everything and it had been sitting for 10 years. The trans was still usable, but the engine needed to be completely rebuilt.
Do you have a picture of the one you have?