Any one who is willing to accept a PO from the school can
purchase Qlab for you on business or corporate Credit Card. Set up your account with a starting Password, and account details you can pass off to your local audio
house. Most companies/ Rental houses would be probably willing to accept a PO +10$ for being the middle man in the transaction.
A company out by me in NJ (Norcosto) is the go to source for "we need X
widget" thing from amazon, here's a link." Norcostco will by it and invoice the school. They also deal in costume rentals, lamp/
gel replacements and other theatrical consumable and equipment. But they will also operate as a middleman for nearly anything you would like, if you can tell them exactly what you want. Everything is a little more then you would
purchase the stuff privately, but they are willing to accept PO and net 30/60/90 days payment, so they have niche slot in the world.
I'm sure there are similar companies locally in your area that would be happy to do this. Or give Norcosto a ring, as being in MA, you're not to far away. But the best would be to find a already school district board approved vendor.