Amazon,funimation etc, you can buy the full box set on amazon exclusively or 1 set at a time

Edit: here you go Dragon Ball Z: Seasons 1-9 Collection (Amazon Exclusive) [Blu-ray] https://www.amazon.com/dp/B075KZBHD6/ref=cm_sw_r_cp_apa_i_v0zeCbPXC0PJT

That Amazon exclusive box set has been available seasonally for years. It's currently #399 in Movies & TV and #15 in Anime. It sells well.

Most people who buy Blu-rays are not very knowledgeable about them at all. They just want their favorite series on Blu-ray.

https://www.amazon.com/Dragon-Ball-Seasons-Collection-Exclusive/dp/B075KZBHD6/ref=sr_1_1?dchild=1&keywords=dragon+ball+z+amazon+exclusive&qid=1624395885&sr=8-1

​

https://www.amazon.com/Cowboy-Bebop-Complete-Exclusive-Blu-ray/dp/B00MMOZ1SS/ref=sr_1_1?dchild=1&keywords=Cowboy+Bebop+amazon+exclusive&qid=1624395968&sr=8-1

​

Not sure why they picked Amazon. Normally once they sell out, that's it, but Dragon Ball Z did come back in stock.