Amazon.com: Streacom" ST-OB2 Slot-Load Blu-ray Reader Chassis : Electronics
How to Install a Slot-Load DVD-Drive into PC with AFT EX-DVD Kit - YouTube
Here's something interesting: a slot-loading 5.25" optical drive made by GoldStar : r/vintagecomputing
SilverStone Technology Slim 9.5mm Slot Loading DVD-R/W Disk Drive with Physical Eject Button, Includes both 9.5mm and 12.7mm front Bezels SOD04 : Electronics - Amazon.com