Crucial's X8 portable SSD offers amazing performance with up to 1 GB/s transfer rates. Internally, this is a real M.2 NVMe SSD similar to the Crucial P1. Priced at only $130 for the reviewed 1 TB variant, the X8 is very affordable, cheaper than buying the SSD and enclosure separately.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips