OP, obviously, you realize that you are in an expensive area and at Westchester hunter barns there are going to be big commissions to be paid. Those nice old show horses are often available free if they are going to a great barn because the owners want them 'off the payroll" but want to be able to keep an eye on them. The problem is that there are rarely commissions to be made there.
If your goal is to do A shows and win/ribbon well, you might need to spend that but if you are looking for a safe, sane horse that you can have fun with and maybe do some shows you and/or your trainer should look farther afield. My guess is that sales barns that specialize in show horses are going to be most expensive because the seller is paying high sales board rates and those places deal with high end big $ clients. ( I noticed that you replied on a sales barn thread.) Barns/trainers tend to have their circle of contacts and most of the contacts are barns very much like their own. If they are an A circuit outfit, so are their contacts.
If you are on Facebook, do some independent research. Look for regional equestrian sales pages and see what’s there. Contact sellers and get an idea of bottom line pricing. Find or post an ISO (In search of) ad and see what shows up.
I’m in the Capital District and several of the local barns go down to Westchester and the Hudson Valley to show (Gardnertown, Old Salem) over the fall and winter and they do quite well with horses that might not win at A circuit shows but who are capable of jumping around between 2’6 and 3’ with kids or ammys and none of these horses cost $25k or would sell for that.
Would you consider a been there, done that thoroughbred? QH or Appendix? WB cross? Unregistered but a good guy?