I work on Postgres and we have always claimed to support VAX machines but have the caveat "Code support exists for M32R and VAX, but these architectures are not known to have been tested recently." in our documentation. Recently I started a project to get a member in our build farm building Postgres for VAX to fill this gap. So far I've been using simh but I would be really interested in getting a decently fast VAX that doesn't take too much space (or power) to run builds on.
I am currently in Europe (Dublin) but will be visiting NYC, Florida, and Montreal in the upcoming months so this is a good chance for me to pick one up without paying exorbitant shipping if there's any around. -- greg