anyone got experience with this version of peg 2.
Yes, I have one G3 Pegasos 2 myself (and one G4 as well).
is it fast enough for morphos 2 ?
Depends on what you will use it for, of course.
how hard are the g4 cpu cards to come by and how much they go for
Extremely hard. I'd say that 99.99% of the people bought their Pegasos 2's in motherboard+CPU bundles only. They figured out what kind of price/performance was the most suitable for them, and then they bought that combo.
In fact, I can only recall one occasion where I have seen someone selling a CPU card stand-alone:
Magnetic, on MorphZone.org