External enclosure for SSD (PM951, M2)

Hi All, 

I've extracted the SSD from my XPS 15 and i'm trying to find an external enclosure for it so i can carry it around like an external HD. I've been to a lot of computer shops around London and nobody seems to stock an enclosure that fits. 

The SSD h/w specifications are: 256GB PCIe,Samsung PM951, M2, Product Number MZVLV256HCHP. I've found a page with more details of the specs here. 

I'd appreciate it if anyone could help me find an enclosure online that fits. I found this, but it says it's not PCIe compatible, and i'm skeptical of buying without a second opinion. 

Thanks, 

Seng