Surface Pro has a standard mSATA interface in there if you don't mind tearing it apart. It won't take the part in the OP, but there are lots of them on newegg in sizes up to 480GB.
A fair point, although it seems that Microsoft has designed the Surface Pro in such a way that it is particularly difficult to take apart and put back together. iFixit gave it a repairability score of 1/10.
It seems similar--one manufacturer restricts modification by changing the connectors, the other by changing the casing.
Honestly, none of that looks particularly intended to make it difficult to disassemble. It looks like design choices intended to make it as compact and light as possible.
Are you sure? All sources I've seen say that on the Pixel the flash is soldered on, and that the apparent mini-PCIe port doesn't work with a mSATA card.
