WANTED: Buster for a4000 - Would any revision work?

[pedro7]

I am getting an a4000 motherbaord which is missing the super buster (empty socket) so I am looking to find a super buster.
The super buster rev 11 is the best as I understand and supports all the Z3 features.

However I am thinking the cards I have won't need a rev 11:
Powerflyer a4000 - doesn't use DMA? I think this was designed to work on all Z3
Cybervision 64/3d - is a Z2 card and so buster revision shouldn't matter.

So I'd like to ask
1) Are my assumptions correct? Could I use any super buster, ie a rev 7 from an a3000 or a rev 9?
2) Does anyone have a super buster they could sell me?

[pedro7]

I am in the UK.

Those prices all seem bit high. I was hoping that someone would have a spare older revision that I could get cheaply secondhand.