I'd suggest picking them up from the Connoisseur Society directly. The two-disc sets are $13.98 each, and shipping in the US is free, and overseas it's cheap. That makes the cycle $56. http://www.connoisseursociety.com/ has the info. And some more recordings. I've only listened to a couple sonatas so far, so I can't really comment too much, but one needn't pay too much for these recordings.