I'm in possession of GVP G-Force 040 Combo Rev 6 with 12MB and 33MHz chip, parallel, serial and DMA SCSI. Should be easy to overclock. It's my spare so it has low miles. Original box, manual and disk.
I also have GVP Impact A3001 rev.4 with the Rev 3 RAM32 board, 28MHz 68030 and 68882. I don't remember the amount of ram on this one, just that it's 60ns (I think it's only 4MB). Original box, manual and disk. Chips and quartz are in sockets, so it should be easy to upgrade.
I also have 68010 board and some higher speed 68000s, but I have to check on those. Tons of GVP and A2091 SCSI cards. Few bridgeboards and other spare parts for A2000.
I've been meaning to put those on ebay. Although I have a trip coming up, so it might be no sooner than middle of next week.
