Appears to be a solid frame and not a take down. I think they go for around $800-$900, but really don’t follow what they sell for. It sure looks like a nice one.
They are a nightmare to reassemble and parts are not as available some times. There are a couple guys who are active on the Cast Boolits web site that really know Marlins. You might want to join and ask about it there.
if you are in Renton run it down to Pintos and ask Chris.