https://www.microsoft.c
Bought this last week for $239.99 through HP after coupon. This is another $40 cheaper.
Product page:
https://store.hp.com/us/en/pdp/om…NwodzN0FkA
These are basically enclosures that allow for a video card to be used externally (typically by a laptop via Thunderbolt). Some include a video card, some do not (this one DOES NOT). More information on these types of enclosures can be found here:
https://egpu.io/external-gpu-buyers-guide-2018/