I can't seem to find any place that sells Bitex hubs outside a few models.

The hubs I'm interested in are BX404R.
Trying to find some lightweight reasonably priced Boost spacing hubs in 24 or 28 spoke.

Don't seem to be on ali, but just google Bitex and find a few sellers closest to you and if they don't have it on the website, contact them and ask if it's possible to get one.

Otherwise, if youre open to alternatives:
these are absolutely top tier, you can contact them through the site, or you can search the model name on ali and get the same product under like 20 brands.

https://www.carbonbikekits.com/index.php?route=product/category&path=254_262&fa125=MTB%20Hub

I've ordered Bitex parts from Bikehubstore.com.
Perhaps they can help you out?

I've never even heard of that model. I also ordered some Bitex hubs from BHS a while back. If they don't stock them, I have no idea who would. Good luck.