WorldWorkGames products will soon no longer be available via RPGNow and DriveThruRPG after July 11th.
From their announcement:
DriveThruRPG and RPGNow will no longer be selling WWG titles after Monday, July 11. If there are any WWG titles that you would like to purchase soon, please do so by July 11.
WWG is allowing DriveThruRPG and RPGNow to maintain private access to your previous WWG purchases for the foreseeable future. You can access your previous WWG purchases from the “My Library” section within your account, even past the July 11th date.