Apricorn Velocity Solo x1 Performance SSD Upgrade Kit for Desktop PCs and MacPro Serial ATA600 PCI Express 2.0 x1 Plug in Card 2 Total SATA Ports - Office Depot
startech.com 4 port pci express 2.0 sata iii 6gbps raid controller card with hyperduo ssd tiering - pcie sata 3 controller adapter - Walmart.com
SHPM2280P2H/480G Kingston HyperX Predator Series 480GB MLC PCI Express 2.0 x4 M.2 2280 Internal Solid State Drive (SSD) with HH-HL Apdater
Plextor M6e SSD review: It's faster than a SATA drive, and not much more expensive