This is a useful list of all the upcoming clinics in the US for testing for a wide range of conditions.
Don't forget that hearts in particular are a concern with cavaliers, so attending one of these low cost clinics to get a cardiologist's assessment is very valuable. Usually your cavalier should be about two before you cardiac test, since MVD is a progressive condition. So much can be done if murmurs are caught early that this is one of the best tests to do annually.
Several other of the listed clinics may also be of interest to cavalier owners, too.