eBay sellers in the United States are not posting worldwide because of the pandemic causing shipping times to be extremely slow. I too am only posting in the United States until things get back to normal.
I had gotten in many of those Phase 5 Cyberstorm MK2 boards through the years. I remember getting one in each of the five Amiga 3000T computers that I had gotten in. Since about 99% of all Amiga software does not take advantage of that board, I sold all of them to Amiga fanatics puffed up with ego They usually sell for $600 to $800 each. That's what I got for them. Remember, most Amiga software runs great on a STOCK Amiga 500 computer with 512K of Chip memory and 512K of Fast memory. Many people allow their ego to cause them to spend way too much money on this vintage computer hobby.
You are not going to believe this, but, the best processor board for an Amiga 2000 is a 68020 board. Once you go past a 68020, you lose a lot of software compatibility. This is the reason why Commodore installed a 68020 in the Amiga 1200 computer. The only "upgrade" that you actually need is more Fast memory, and this is only if you plan to use Workbench 3.9 in 256 colors mode.
Oh, some Amiga games require at least 512K of Fast memory.