There are also available through Amazon and Target (!). I bought the first set direct from DG (minus the Schubert). They arrived last week here in northern Ca. Haven't listened yet as I want to clean first. The Beethoven and Stravinsky were admirably flat, but the Mahler 5s were warped. A session in the Orb flattener took care of that.Unfortunately, neither Acoustic Sounds nor Music Direct have all 11 albums available. They don't even have all 7 from the upcoming September release... so as much as I would love to find an alternative to DG.com, I don't see one... if you're interested in the full set, that is.
You might also want to check out this thread on the DG releases: https://forums.stevehoffman.tv/threads/dg-classics-aaa-reissues.819541/page-36