Allegedly, a Pete Cornish Modded F2-B is For Sale, Here:

[Zut8083]

Just $2,950.00...or enough to buy a decent 1995 Honda Civic CRX.  The amp has expedited shipping, though.
https://www.ebay.com/itm/Ultra-Rare-PETE-CORNISH-modded-Alembic-F-2B-1970s-Bass-Preamp-David-Gilmour/142820233905?hash=item2140bfd2b1:g:ePQAAOSwBOlagJuY

And a F-1X is for sale, here, for $550:
https://www.ebay.com/itm/Alembic-F-1X-Tube-Bass-Preamp-Mono-Pre-Amplifier-F1X-30333/172997198747?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D52570%26meid%3D23b6d6188dc84622a32f6fb9c71ea16f%26pid%3D100005%26rk%3D3%26rkt%3D12%26sd%3D142820233905%26itm%3D172997198747&_trksid=p2047675.c100005.m1851