You are lucky. Until January you've some time. You might have a charismatic president by then, who happen to have hoards of money. (You know now what you and your pupils need to do?)
https://moodle.com/cloud/ would have been your free alternative. I hope that your 150 pupils could put aside USD 5.- per month (3,33 penny a month) necessary for a shared site with a mass hosting provider for their education.
BTW, are you sure that you need the same thing as Theresa https://moodle.org/mod/forum/discuss.php?d=327851, except that you share the same subject line?