English Tack Trader on Facebook you can find many boots brands sizes you name it!
buy a used pair, wait until you are done growing to invest in a high quality, new pair
I ride in half chaps but ariat close contact so they look like tall boots from a distance. If you can't do chaps you can always find a pair of on sale boots at your local tack store. What I do with most things is buy something and keep it for a year or at least use it until I NEED a new one. Hope that helped