[vcf-midatlantic] WTB: VAXstation 3100 Memory Module (MS42-CA or MS42-BA)

I'm looking for a memory module for my VAXstation 3100. Mine is one of the smaller Model 10 slabs. The memory modules I'm interested in are MS42-CA (16 MB) or MS42-BA (12 MB). I'm particularly interested in the MS42-CA since it's the only one with a stacking connector, which you need to increase memory beyond 20 MB. Thanks, Jonathan