I was toying with the idea of a project that would involve adding a SATA device to an existing PCIe lane; probably far too ambitious for me, but before I could confirm that I noticed that there aren't any PCIe-SATA bridges available from suppliers like Digikey, Mouser, Element14.
There are PCIe/SATA redrivers & muxes, and PCIe-USB bridges, and USB-SATA bridges, but not PCIe-SATA bridges. Such chips exist (e.g JMB58x) but are not available anywhere that I'm aware of that an individual/someone ordering low volume might be able to use.
Am I misunderstanding some terminology? My best guess was that it's just too specialised/high speed, unavailable because nobody/org that can't 'call for pricing' etc. would be capable of using it anyway - but then surely that would equally apply to redrivers and muxes, and to PCIe-USB bridges for that matter.