ML has been selling some of their (mid) "Designer" line products on Amazon for quite a while now. However, their top "ESL" series is (currently) only available through local high-end dealers. With the demise of the Tweeter chain, they've lost a major portion of their distribution/sales network, so they've gotta be looking for new channels. I don't see them selling the CLX, Spire, or upcoming Summit X, etc via Amazon, but they might be forced to start doing so at Best Buy/Magnolia. That's scary!
BTW, the Costco Summit sales were an UNAUTHORIZED channel, and ML quickly shut that down.