A Best Buy memo published by AppleInsider fills in some details about the Mac rollout. The memo notes that while Macs began a limited rollout at select stores on August 3rd, BestBuy.com Online will be carrying Apple computers nationwide.
Indeed, Apple laptops (along with Apple accessories) have returned to BestBuy.com (after being removed on August 4th), however, the $150 Mail-in Rebate now specifically excludes Apple laptops from the promotion.
The memo also reports that Macs will be featured significantly in advertisements starting on August 10th (Sunday).
