If it's for schools you can reach out to the raspberry pi company directly and often they will make some available to you, after proof it is for school/learning. At least this is something I remember reading some time ago. Worth an email to them at least.
Ecterun t1_j3m4zid wrote
Reply to comment by tnevets_10 in Raspberry Pi launches higher resolution camera module, now with autofocus | Alongside the company’s Camera Module 3, it’s also releasing a new module for use with M12-mount lenses. by chrisdh79
If it's for schools you can reach out to the raspberry pi company directly and often they will make some available to you, after proof it is for school/learning. At least this is something I remember reading some time ago. Worth an email to them at least.