^^^THIS^^^ @M20GforMe this is the bottom line. Personal experience and reading this forum has taught me that an airplane for sale that does NOT have deferred maintenance is a rare bird. Americans, or the pilot community, or maybe just Mooney people want "cheap" above all else, and nobody wants to spend money on an airplane that has fallen into disuse. You have received a ton of advice here mostly suggesting that you got screwed on the sale, and that you continue to get screwed by your shop. I'll swim upstream and say that a quick review of the estimate did not look wildly out of line to me. The hourly shop rate is not bad for your part of the country -- check out the hourly rate for a plumber. Sounds like they looked at everything, found a ton of discrepancies, and estimated the time and materials to fix everything. If I were in your shoes, I would work with this shop to understand what needs to be fixed to get your annual signed off and what can be deferred a year. The cost is brutal, but if you burn this bridge now, you may come to regret it later. Good shops are hard to find. Personal relationships are everything.