Amazon.com: RackChoice 3u Short Depth rackmount Server Chassis Micro ATX/Mini-itx 2x5.25+5x3.5 Bays Support Standard ATX PSU with Either top or Side Cooling : Electronics
SL-3U-MCX-C236SAEM-GK
3U PC i9-9900K Industrial | 5 PCIe Slots
19-inch ATX rack-mount 3U server case - IPC 3U-3098-S - 53cm length
Amazon.com: 3U Server Chassis - Compact 12" Deep 19" Rackmount ATX Computer Case (Back or Front Rack Mount for Easy Access to Rear Components & Ports) 4 Bay 1x5.25 3x3.5; 4X Full
Products | Sliger
Sliger CX3152i 3U 15in Rackmount Server Case - ATX PSU and 240mm AIO Support, 5.25" bay - DENSITY.sk
3U Quiet, MicroATX Chassis - General Technics
3U (1 x 5.25" Open + 3 x 3.5" HDD Bay) (ATX / Micro-ATX / Mini ITX) (11.81" Deep) (Front / Rear) (Rackmount Wallmount Chassis) IPC-3013S (PLinkUSA.com / RackBuy.com)