Well, I've had a 10EE for a while. A good one is well worth the money. Mine came with a lot more tooling and other misc. tooling and parts. Is it a WIAD or what year is it? Remember some models have old time tubes and electronics. Some of the tubes are almost unattainable and are in the $200-$400 range if you find used ones. I was lucky and received an extra set of tubes. Parts are readily available and expensive. There is still a Monarch USA company. Go to The Practical Machinest forum and they have a very big active forum on Monarch lathes. A lot of very knowledgeable people are on it.
PM me if you need a lead on one. I personally think he is a couple or $3,000 high.