Like you said. the VXL-30 is mostly useless without a the RAM32. I made a mistake by buying one back when they came out and could not get the ram32. It took me forever to find one and it was overpriced.
Back to the ram. Sometimes the ram comes up on Fleabay. 20 pin dips were fairly popular back in the day. But Alas the 256kx4 come up more often than the 1Mx4s. Also usually, at least with my experiences, the 1Mx4s are usually 80 ns not the 60s. The 256kx4 in 60ns seemed to be easier to find, again in my experiences.
I personally would rather have 8 meg of 80ns ram than 2 megs of 60 ns.