I missed out on Ambush!, and would be interested in a reprint.
I think you'll all have to be satisfied with eBay. I see the chances of a reprint as nil. The rights for Ambush probably are part of the Avalon Hill property that Hasbro acquired and it doesn't seem to be something that Hasbro would be interested in. I suppose that MMP might to it, but I don't see any evidence they're interested either.