The one Chriscokid posted for march CL is a 1955 7U for $2500
Unless you can take it for a "Test Drive", then you have to figure out its "Scrap" value.
Why?
Because you do not know what if any underlying problems it has besides the Pony issues.
Then,
You need to pad that number with how much can you afford to lose if it indeed has underlying issues.
Thats the amount you want to spend!