To be fair, isn't the maritime market a bit like the aviation market, where a pack of 6 disposable AA batteries potted in a pack will cost you $43? (https://www.youtube.com/watch?v=d1YjGLwfYSQ&t=37)
On land with a good supply of fresh water (so, not in drought regions) I think you could probably cool a dish for a few dollars of parts with an open-loop cooling system. I'm not sure how much water you would actually need though, it might be an unconscionable waste in the regions that are prone to these sort of temperatures in the first place.
Fair point, a portable AC sets you back 150 dollars or so, so with outdoor proofing and all, you can build a passable cooling system for 250 dollars. That would be the proper engineering solution, but it wouldn't look cool, like the steering yoke in the recent Tesla.
OK, maritime outfitters will sell you a climatized radome, which will set you back a few grand. Proper engineering costs money (can't have radar fail in the middle of the Strait of Malacca), and that's why Elon relies on his army of fanboys, Elon's outrageous conduct is part of marketing.