BB quad babies sold on another site

I’ve never seen this before. I saw two of the RuBert quad kits for sale on another well-known supply site. Would this be considered a “secondary market” for them? For some reason, I thought that BB kits were exclusive to BB.

No ajhunter on ebay is a BB dealer!! And Beautiful doll is also!!!

I would say all of them are secondary. I am not sure that they have the same prices as BB.