A UK company called sigmer (www.sigmer.net) offers shared linux hosting with PostgreSQL from £40 (~$55) per month for 2.4Gb/month/50Mb disk space/25Mb DB space. We've used them in the past for an OpenACS project.
If there are just a handful of people who are looking for hosting, as Rolf suggests, and these are the core OpenACS developers, maybe those of us who've made money from ACS/OpenACS could pool together & stump up for a hosted machine somewhere (from about $4,000/year) & maybe offer subsidised rates. I suggested this kind of thing a while back in the context of hosting OpenACS.org (is that still a requirement?) but it kind of faded away. I'd have to put it to a vote to the guys here but I reckon we'd make a contribution.
