SATA 3 Expansion Card 10 Port, RIITOP PCI-e Express x1 SATA 6G Controller Card, SATA iii 6Gbps PCIe Adapter Card, Come with Low Profile Bracket and SATA3 Cables - Newegg.com
PCI Express Serial Card, PCIe to RS232 - Serial Cards & Adapters | StarTech.com
SATA III + eSATA 4-port PCIe 2.0 x1 card (ASM1061 chipset) | eBay
HighPoint Rocket 620 PCI-Express 2.0 x1 SATA III (6.0Gb/s) Controller Card - Newegg.com
VisionTek 4 Port USB 3.0 x1 PCIe Internal Card - PCI Express 2.0 x1 - Plug-in Card - 4 USB Port(s) - 4 USB 3.0 Port(s) - PC
PCI Express - Wikipedia
What are PCIe x1 Slots Used For? | 8 PCIe Devices for x1 Slots - YouTube
Syba PCI-Express 2.0 x1 USB 3.0 2-Port Card with Low Profile Bracket, 1 unit - Kroger
StarTech.com SATA PCIe Card 2 Port PCIe SATA Expansion Card 6Gbps SATA PCI Express to SATA Adapter Non-RAID PCIe to SATA Converter - SATA III 6Gbps PCIe 2.0 x1 card - SATA expansio
ToughArmor MB839SP-B 2.5” SATA SSD/HDD to PCIe 2.0 x1 Hot-Swap Mobile Rack for PCIe Expansion Slots. PC PitStop Data Storage Solutions - SAS Enclosures, DAS, NAS, iSCSI & FC SAN
Pcie Sata Iii 8 Ports Controller Card Pcie 2.0 X1 Sata 6g Expansion Card With Low Profile Bracket Support Win10 Pcie Sata Card - Add On Cards & Controller Panels - AliExpress
USB-C Adapter 2-Port USB 3.1 PCIe CardX1 - Coolgear