Breadtopia is another great site that carries it plus other unique items for breadmaking.
I ordered mine from them because I heard reports of problems with cloches arriving broken from Amazon. It came quickly in perfect condition. I also ordered some uniquely shaped (like an artist palette) flexable dough scrapers. They also have great demonstration videos and are a pleasure to deal with.
I received a cloche from the King Arthur catalogue for Christmas and love it for the no-knead bread we've been devouring. Before I got this, I once used an old clay baker (remember the "Romertopf"?) but learned a hard lesson when it was preheated to 500 degrees and filed the house with black smoke. Seems the "do not wash" mandate leaves oil in the clay pores which burned off quite nicely.
Also, pre-cloche, I was using my LC doufeu for baking bread - it has no plastic handle to worry about at high temperatures.
The cooking class teacher/school can't come up with anything? King Arthur used to sell one, did you check their site? You don't see them around much, I think their general 15-minutes-in-the-sun ran out some time in the mid 90s.... You could try looking through a recent edition of one that era's bread cookbooks and see if any souces listed might still be options.
FWIW, I wouldn't bother correcting what might well have been a typo but "artesian" isn't just a mispelling, it's a totally different word from "artisan." ;)