Best Buy offers preorders of the Apple MacBook Pro Core i7 Quad 2.3GHz 15″ Widescreen Notebook with Retina Display, model no. MC975LL/A, for an in-cart price of $2,089.99 with free shipping. That’s $230 below our mention from two weeks ago (which included AppleCare) and the lowest total price we’ve seen for this model. (It’s currently…