Granted this is only anecdotal, since I haven't been saving those auctions, but of all the
MM's I have seen sold, prices have been WAY down over the last couple years. Unless it's a near mint 1st print which could fetch over $100, I think 2nd and 3rds are in the $20-$30 range at the very highest. 3rd+ I'm thinking goes the same as 4,5,6th, etc.
EDIT: hmmm, I guess I take that back .... the Rural Retreater seems to have sold one for $35 in a BIN
** expired eBay auction **I find this a bit surprising. I'd have to search out more to see if this was really the going rate.