Not sure if this is widely known but sorry if it is, but most schools provide Windows 10 EDU for free and some also include Office Professional 2016 or even Win 10 Home/Professional. So it's worth checking out if your school is eligible.
If your school isn't there, you might be able to let your IT team/help desk know and they can request one here: http://kivuto.com/windows-10-student-use-benefit/.
I don't believe there's a cost to the school or students to set a store up.
it gets a run every year on ozb: https://www.ozbargain.com.au/deals/onthehub.com
but handy reminder for some.