Still not found the McDowell reads, but did find David McCallum's THE RATS IN THE WALLS
Also I've come across a whole library of newly read Lovecraft audiobooks read by Wayne June. Wayne has a voice like a cross between James Earl Jones and Tom Waites... deep, gravelly yet smooth. This guy is perfect for reading HPL. The cool thing is that the publisher, AudioRealms, has been diligent at getting the CDs out to libraries and so should either be easy to find at your local library or through inter-library loan. There are samples of each story
at the AudioRealms website. Volume 7 with Charles Dexter Ward should be out anytime now.