On this: http://www.musiciansregistry.com/resources/musicians_unions.cfm site the coop ads are almost hidden. You will find them at the bottom of the page, in a very small font with a text color that is very similar to the background color. I fear I won't get much traffic from this site, unless they make the ads more visible.
This page looks like it was made by a big Baptist that does not want to be caught in the liquer store. Wants benefits of co-op without wanting to be associated with it.