I don't think Reyes would be extremely expensive. He's got 10:$9M,
11:$11M club option ($0.5M buyout) left on his deal. Not too bad, but not exactly peanuts. Given the Mets current financial circumstances, it wouldn't be to bold to say they might be cutting payroll soon.
Don't see them moving Santana. Too difficult IMO. Plus his elbow issue.
Not sure I see Wright moving either. It be nice, but he seems like the player to build around.
You could make a case for Beltran and Reyes being made available.
Besides those 4, there isn't much else I'd be that interested in.