Yeah, this is pretty standard. Between the low production numbers and the fact that assembly is probably occurring in a country with stronger labor laws than wherever mass-producted hardware is made (mostly China), it's going to cost more than something you can pick up on Amazon or AliExpress.

There have been a few cases where open-source hardware like this has enough demand to get picked up by a Chinese manufacturer who makes a cheaper version through some combo of unethical labor practices, production scale, employing cheaper or cloned parts and/or dropping features, so it's not out of the question that a cheaper version comes along, as long as you don't mind the compromises to get it.