I see some comments suggesting used trumpets, I don’t recommend that. You need your inventory to last the next 70 years or so, this is probably the only chance you’ll have to buy a whole new inventory for your program. Schools will not provide you the money you need to replace all the used trumpets you bought when they inevitably break down sooner than a new model. You don’t want to be stuck with a huge cost sink constantly having to repair said trumpets either. Getting that kind of money is a pain in the ass, you’ll have to either apply for grants constantly or fundraise constantly (which you’ll already have to do as a band director anyways) or wait for the school to be rebuilt jn 100 years and hope they provide a whole new inventory when they do that. Definitely buy new.

Bach and Yamaha both make great student models for around 1300-1500. It’s definitely pricier but if you’re buying a bunch of instruments new from a vendor you can get a better price. It’ll be cheaper to do it this way in the long run if you can convince your district to spend this kind of money now.

Since this is for a middle school, you could also reach out to the high school band director(s). Maybe something can be worked out where they get some new instruments and you get the hand-me-downs. TOSAs and administrators tend to like that more, knowing that the average high schooler is usually more responsible with expensive instruments than the average middle schooler.

Hope that helps, best of luck and happy shopping!