I have two suggestions.
- Buy resale -- e.g. here on TUG, Redweek, eBay, etc.
- Read the excellent "Sticky" (Wyndham Articles) at the top of the main Tug Wyndham page, especially the part about purchasing resale. When you have read that, you'll have much more information and it will greatly speed your research.
To try to answer your question partially, there is a spreadsheet (I believe it's linked in the above Wyndham Articles).
However, in my purchase research, I found a good bit of variance, within the same resort, on the maintenance fees from contract to contract. So I think the spreadsheet is a helpful guide, but you really have to do a lot more research than having someone what they think the MFs are at a given resort.