I'm 110% certain I still have two TI-83's lying around in mint shape when I was in high school (when it was required to shell out $50 each). Now they're rarely used due to the changing tech. It's still a travesty that education is far behind the times. And we have to thank TI's lobbyists for decades of making sure that only those who can afford it can use them. Sad state of affairs in the education front.
I still recall trying to tinker with those two TI-83's with some degree of success and it made it fun to do when you're aren't doing anything special as a side project.
Worth a read [gen.medium.com]