I bought mine about three years ago in MN.
I'd say it's 95-97%+, and the asking was $350, I paid $325.
I don't at all feel like I was ripped off.
First, the M18 an excellent gun.
Second, there weren't a whole ton of them made, surely not as many 18's as 10's, 15's, or 19's.
Three, they are getting older, and the ones that are for sale aren't as nice as they used to be.
I love this gun! I'd consider anything under $300 to be a good deal if the gun is in nice shape.
Someday, I'd like to find one that's a little more worn, convert it to roundbutt, and reblue.
-Kframe