Instead of wasting $30 million dollars on the cool toy of the moment. How about getting a few teachers iPads and Electronic/Digital Chalk boards, you can probably do some really nice innovative teaching that way without giving every spoiled brat an iPad.
What, you think regular desktops are cheaper?
$299 Dell Inspiron 660s with CELERON processor, WITHOUT a monitor ($99).
$399 above WITH monitor.
$329 iPad Mini
And the Dell will use about 10x more power.