I don't want to wait 8 years for them to make processor card, when Jens has just produced the ACA cards.
Based on my own purchases E3B, AmigaKit, Jens Schoenfeld and Elbox are all still active and producing and/or updating their products and plan to release new products. I have a Mediator 4000 MK2 (it's labeled differently both on the box and circuit board, for example).
The GVP stuff is available (from the new production run). I got one of the newly produced GVP Spectrum graphic cards last year. Although I think some of that new stock is sold out now.