Anyone know of a place to find these in BKK? I've checked a few malls and no one seems to even know what they are, let alone have any. I'm in eastern Bangkok so would prefer Seacon, Paradise, Central BangNa or similar. If not I guess I'll have to order from abroad but it seems like something that should be available here.

have you tried Pantip? there are several shops there that have theater setups at the shop with movies playing on them.

The hardware shop in the basement of Tukcom Pattaya has them, if you fancy a trip to the beach.