Red Rock 35mm adapter...what is it worth?

Depends on what you have with it and what size achromat. I sold a RedRock with a 58mm achromat in a hard case for $700 about six months ago.
 
I'd check the RR site for starters, since the Encore came out, the prices of the original M2 have gone down a lot.

EDIT: Just checked, it's now $995 for the M2 and rails, etc. brand new.. so I'd say anywhere under that is a good starting point, depending of the condition of your unit.
 
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