Thanks for posting that, I ran the #s and the Best Buy discount (pre-$100 off) is marginally more expensive like $25 more for the closest 13 in. rMBP I'm looking at. The 2.7GHz 8GB RAM 256GB memory base model. The Apple school promotion should also be an equivalent $100, except it's not here yet and may not even come this year.
If anyone is in a rush and doesn't mind getting the base model, they should definitely go with Best Buy since it'd still be only $25 difference, and that's if the Apple back-to-school sale ever happens. It might not.
Because I'm looking to upgrade the specs and waiting to the August sales tax holiday, I don't mind waiting for the Apple BTS to come out. If the BTS doesn't come out before then, I'll probably settle on the Best Buy on-sale base model + student program in August.
Best Buy sale = Apple educational discount
Best Buy student program now = Apple BTS promotion still yet to come