I've just come across this website where you can but the Renaissance releases from as well as lots of other classic rock re-issues. It seems all CD's sell for $12.98 each. There's lots of great titles but I'm a bit nervous about buying as I've heard that many of the older re-issues on this label are poor. I have no way of knowing which are the old poor quality re-issues and which are the new ones.
Most of the Renaissance stuff I have are all pretty good and definitely no worse than some re-issue labels (that shall remain nameless) that are releasing stuff at the moment. A few odd ones that weren't great (The Charlie stuff for example), but otherwise, perfectly acceptable to my ears and definitely better than nothing at all.
Renaissance have an ebay store which I found is the best place to get there stuff from.