It takes one that is in very good shape to bring $350 for IH on the far end. It was builtin the 70"s.
The other three would be in the area of $400 each.
There are some like those on Ebay right now. You may watch them to see where they end up.
In todays economy those prices I gave may be abit high.
Don"t know about the stroller but we had one just like it when I was a kid.