I've seen a couple of Alembic basses on Dutch auctions.
Here we go:
Series I (standard Omega) from 1978 (refinished not by Alembic and one of the omega points has been repaired, also not by Alembic) 1500 euro
Alembic Mark King signature coco bolo (I know the seller and I know it is in a very good condition) No fixed price
Alembic Stanley Clarke signature, no fixed price
Alembic Essence (walnut), also without a price
Alembic Epic, 990 euro.
All basses are four string basses.
You can see pictures of it. Go to:
http://www.advertentiezoeker.nl/ (Trefwoord) Alembic (zoeken)
The Essence bass is in my hometown and the Mark King belongs to a fellow clubmember.
FYI:
Shipping costs to the US are in the 250 USD range, well, that's what my last shipping costs were for a series I plus case and power supply.
Since these add are all in dutch, me and probably some other dutch clubmembers are always willing to help you out.
Manfred