Yeah, I think that seller is capitalizing on being the only source on the site. When I bought them years ago, I don't think I spent more than $30 total.
I'm trying to find someone who regularly gets them in, even if they're not always stocked so I can get a ballpark figure, or someone who can get them if they have an order request. I'm definitely getting ahead of myself, I just like to know my options and plan as much as possible when I start a tank. Patience isn't one of my virtues and I get excited planning a new tank!
They are absolutely amazing fish, I loved watching them scoot along the glass and bury themselves in the sand with just their eyes peeking out. I noticed them disappearing from big stores, probably due to the fact that they are called freshwater, but really need brackish so they probably weren't doing well in tanks, the same with the dragon gobies you used to see everywhere.