I paid $50 for a used (Big Red?). Have had 2 engines on it and pulled the IMS on the second engine, that is still on the stand. There is a picture at the beginning of this thread.
So... I have this spare engine.
I have since modified the stand with 2 wheels at the front in place of the single caster in the photo... much easier to move and more stable. The modified version is pictured in post #12.