Sad to hear, thanks for the news. Disappointing, but not surprising. Hearing this motivated me to finally order a 5.25" 4K blu-ray drive for my PC project, I wish I hadn't put that off this long. There were definitely more options available on the market a year ago. If anyone else is looking, here's the best eBay used price I found this week: (and they accepted a lower offer than asking price)
https://www.ebay.com/itm/226741714996
For a new one (with rip-unfriendly firmware) these are the most promising leads I found:
https://www.neobits.com/pioneer_bdr_...p23448728.html
https://www.neobits.com/pioneer_bdr_...p23448727.html
https://www.adorama.com/pibdrx13ubk.html (claims to be restocking in July)
For portable external drives looks there are more options out there still. Get em while you can!