OK, with apologies to the many real bootfitters out there for the violence I'm about to do a complex process, I'd say you have three choices. 1) Buy last season/sale boots at a big box store, then have a reputable fitter work on them in December. That may be a touch cheaper than 2) buying them in December for more $, getting fitted at the same place for free. Hard to say.
If 1), here's how: You have a rough idea of your foot shape, so go to a site like Skinet (can't believe I'm saying this), and look at the boot reviews. They'll usually mention whether the model is high or low volume, narrow or wide. As some very rough rules of thumb based on personal experience, if you have a narrow foot front to back, Langes work well. They're very responsive, maybe not the best bet for bumps. If you have a wider forefoot and narrower heel, Salomons are the call, and they have an unusually wide range of easy modifications to width across front half of the foot. Technicas also work for feet like these. If you have a normal to wider foot overall, more volume in back, Nordicas seem to work, and they have the broadest range of models/flexes. Rossis tend to be middle - low volume, not as extreme as Langes, not great for high insteps. Cannot speak to other brands, but plenty of good ones out there. Everyone has their favs, but it all gets down to fit. Which is your issue.
If you buy at a big box store, mainly what you'll be after is basic flex (suggest 90-100 for you), proper length (finger behind heel when in thin socks or barefoot and just boot shell is a not too shabby rule if you don't have measuring tools), and basic geometry (basic volume relations such as larger rear vs larger front etc.) So make sure the shell is proper length, then put back in the liners, wear regular ski socks. Your toes should just brush the end of the toe box if you stand normally with the boot buckled. If you bend into skiing position, you should have enough room to move your toes just a bit. As you flex, your heel should remain down in the heel pocket. If you have to buckle down well past the mid range of the buckles to keep your heel down, you have the wrong boot. The top of your foot will pay for all that buckle pressure after a few runs. If you feel some pressure points along the sides, especially across the ball, that can be fixed in December. If the entire front half of the foot feels pinched, wrong boot.
But main rule: DO NOT BUY A CUSHY FIT. GO SNUG. That doesn't mean be in pain, it just means everything other than the toebox should be right around the foot, not because of a thick mushy liner but because the shell is close. No slop. Especially in the ankle and heel. Boot liners will pack out, the softer and cushier the faster. Also, it's usually possible to stretch/grind boot shells, particularly in width. It isn't possible to make them smaller. OK, now walk around for a while, drop into skiing position again, see how the top of your midfoot feels. (The walking will accelerate any pressure point that you'd feel after hours of skiing.)
If you possibly can swing it financially, don't do any of this beyond reading reviews. Wait until you can get to a reputable fitter. Above is just if you are serious about not having much cash, and can't wait for January sales. (Which are the 3rd, and best suggestion; rent until then.) Good luck.