I've a Thinkpad X1 3rd generation tablet, which has thunderbolt 3 slots. I am thinking about getting an external GPU enclosure since the thunderbolt 3 protocol itself supports interfacing with PCIe. What I'm looking for is a basic thunderbolt 3 to PCIe adapter. Basically just the cable with the necessary controller board.
I already have a GTX 1060 and a power supply, which is why I thought maybe I could get away cheaper if I just bought an adapter without all the extra stuff. I also don't have a set budget, but 300$ or more is a lot for just the enclosure in my opinion.