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ICY DOCK MB508SP-B Rugged Full Metal 8 Bay 2.5" SAS/SATA SSD/HDD Backplane Cage for 2x External 5.25" Bay HDD / SSD Accessories - Newegg.com
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MB873MP-B by ICY Dock - 8 bay M.2 NVMe SSD PCIe 4.0 Mobile Rack for 5.25" Bay. PC PitStop Data Storage Solutions - SAS Enclosures, DAS, NAS, iSCSI & FC SAN
Raidon iS2880-8S-S2D - 8 Bay 2.5" HDD/SSD Drive Module for 2 x 5.25" Drive Bays iS2880-8S-S2D
Icy Dock 4 Bay 2.5" NVMe U.2 SSD Mobile Rack MB699VP-B B&H Photo
Amazon.com: 2.5" to 3.5" Drive Converter Internal Solid State SSD Card Hard Drive Bracket Adapter SATA SSD Enclosure Caddy Dock Desktop Mac PC 2.5 to 3.5 Mounting Hardrive for Samsung Crucial SanDisk
Amazon.com: Ruaeoda SSD Mounting Bracket 2.5 to 3.5 Adapter 2 Pack,SSD Bracket SSD Tray Adapter 2.5" to 3.5" HDD SSD Hard Disk Drive Bays Holder Metal Mounting Bracket Adapter for PC SSD :
IDE to SATA HDD SSD Caddy Frame Module For 12.7mm Universal DVD-ROM Optical Bay | eBay
ThunderRAID 3 Mini SSD 6 Bay – Maxx Digital
Icy Dock ToughArmor 4-Bay 2.5" SAS/SATA HDD/SSD MB994SP-4S B&H
ORICO Dual Bay M.2 SATA SSD Enclosure RAID USB3.1 Gen2 Type C 10Gbps B-Key/B+M Key Solid State Drive Case Adapter for SSD Size 2230/2242/2260/2280 Support UASP - Walmart.com
Hot Swap Bay - 3.5'/5.25' to 2.5' SATA - Hard Drive Racks - HDD Mobile Racks & Backplanes | StarTech.com
Icy Dock ToughArmor 2.5" SATA/SAS HDD & SSD Mobile Rack
Hard Drive Disk Bracket Optical Bay HDD SSD Caddy Tray 12.7mm 2.5inch SATA 3.0 MOQ:100 - buy with delivery from China | F2 Spare Parts
Best of both worlds: putting an SSD in your optical bay « Super User Blog