I'm in NZ and bought a RPi 512MB, case, keyboard direct from Element14 just before Christmas. Their website is confusing, however, but after communicating with them they just said click on the 'Business' tab (rather than the 'Consumer' tab), put in your details and order what you need. I purchased as an individual using my home address. Their delivery was prompt & efficient, shipping from NSW. $48 + GST for one RPi, $11.30 + GST for the case.
I am also a teacher who wants to trial the RPi before launching it in school but nonetheless the RPi I bought is my own property. Give it a try!