is the USIfAC II (https://www.cpcwiki.eu/forum/pm/#msg69372) still avalibe?
Yes, it has its own thread here:
https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/usifac-iimake-your-pc-or-usb-stick-an-hdd-for-amstrad-access-dsk-and-many-more!/
This forum has a search function, in the upper right of the window.