Might want to look up on internet how to do a wither and back tracing–get yourself a flexible curve thingy to do it with. Make traces of your horse, familiarize yourself with what that means, what it looks like you should be trying out on them.
I live with zero access to fitters unless I haul 4hrs. I educated myself on fit/measuring. Used fitters that would work at a distance, ship stuff to try. Asked to borrow friends stuff, even to just see how it did or did not fit my horse—for that visual “ah ha”. If I located a private seller, even if they had to ship, I just asked if they would allow me to tria the saddle, I’d pay shipping, return in same condition as received. Never had anyone say no or not refund my money if I sent it back. Most people have been thru it too—so thay “get it”.
County dressage saddles have “bucket seat”. It’s a very deep scoopy seat that tends to ride smaller, hold you snug, and usually point your thigh straighter down—that can be painful/not good for anyone with hip issues, or a really wide backed horse, or someone totally new to dressage. Being able to have your thigh /knee with more angle/ hip closed is something to consider and totally fine in dressage despite the image everyone has of the straight down thigh…which too often makes riders like a Barbie stuck down on a Barbie horse. Rider shape and orthopedics and horse shape do come into play…to find the combination that works.
There are many nice saddles out there. Shopping on the cheap— keep an eye on used ones TackTrader and Ebay and local tack sales listing. You can get some steals if someones kid got out of it, sold horse, etc etc.
Some brands that are good, also have a lot of saddles out there. Albion for example, makes wide variety of rider and horse flavors…and there are a lot of them out there, and they are good quality and can be tweaked if needed no problem. I have a hard to fit horse—tried many saddles, had saddles fitter thought should be perfect…horse clearly did not agree. A aquaintenance had a Albion that I could see fit him well and he liked…kept an eye for one like it on ebay. Bingo $800 one came up for sale. It was well used /broken in but fine. Had it reflocked/fitted by independent fitter and everybody’s happy.