The Raspberry Pi 5 is the first single-board computer from Raspberry Pi to feature support for PCIe add-ons like M.2 SSDs. While there are plenty of third-party boards that will let you do that, last year Raspberry Pi launched an official M.2 HAT+ board that lets you add an SSD to a Raspberry Pi 5. Because now it’s small enough to fit inside an official Raspberry Pi 5 case. But they won’t fit in the Raspberry Pi 5 case. Prices vary a little from retailer to retailer, but for the most part it looks like the original M.2 HAT+ currently sells for around $15, while the new M.2 Hat+ (Compact) will set you back about $22.