In terms of the base 2.3GHz MacBook Pros with Retina display, MacMall stores in Southern California (Huntington Beach, Santa Monica and Torrance) all have 20+ shipments as of this morning. MacMall in Chicago, Illinois also has 10 shipments as of this morning. In my experience, they can hold it for you, and they match Apple's Education discount but not the gift card promotion. I've heard conflicting experiences though, so you might want to call in and ask just to make sure.
I've also heard Amazon sporadically shipping orders online but they still show "Temporarily Out of Stock" for both models.
I've also heard Amazon sporadically shipping orders online but they still show "Temporarily Out of Stock" for both models.