Patents for the best accelerators (Phase 5 products) have been the property of DCE for about 6 years now. DCE have officially exited from the Amgia market. There's probably a slim chance for these to ever be manufactured again by someone else.
EDIT: Best SD/FF expansions for A1200 were also, I'm afraid, made by DCE. :-(
These could still probably be found here and there, but it could take you a while to track down a dealer that still has a "new old stock" one for sale.
