[markonen]

The Mac mini itself is not the only hardware cost for AWS here, though: I wouldn't be surprised if their Thunderbolt Nitro hardware cost just as much each. It has to be a very low volume device (relative to other things AWS does).

[Nextgrid]

Considering Thunderbolt is just PCI-Express, I'd expect it to be standard Nitro hardware (whatever that is) plus an inexpensive PCIe to Thunderbolt board/adapter.