Actually, the price ranges from as low as $2.80 to as high as $6.00 depending on whether you're a WGV member, & whether you choose mp3 or Flac. Members pay $2.80 for MP3, & $4.20 for flac on these.
New show each day. Today's is an early Peter Green era Fleetwood Mac.
For the moment at least, they're showing each day's "$4 dl" on the homepage:
http://www.wolfgangsvault.com/