What sort of PRICE are you desiring?
What sort of condition are you willing to accept? ("Rust-Free" in MICHIGAN?? GOOD LUCK!!)
Have you been watching eBay & the M715 Zone website?
I see half a dozen M715s for sale evey week! Everything from "Basket Case" to "Near Perfect"! So I suspect that your wallet & desires have a bit of a misalignment?
Parts are still plentiful & readily available for these things, so might I suggest picking one up with a few "fixable" issues, correcting these "issues", and saving a few $$ in the process?? Besides, "Its not really your's unless you've invested some "sweat equity" (& maybe a few scraped knuckles) into it"!!
I found my M715 stashed in a garage in Gross Point, MI.
Has a couple of small rust holes in the floor but is otherwise rust-free, very straight, very complete, & mostly unmolested!
My long term plan is to eventually replace the floor & sills, and repaint it in OD.
(MAYBE I'll upgrade the engine to a V8 too!)
At that point it WILL BE "RUST-FREE", AND I'll be able to say "It IS MINE!"
Good Luck with your search!
Be sure to check out the M715 Zone website! Great Bunch of Guys!!
-Bear-