I think you are late if you didn't get it yet. You had to update the 3DS and log onto the E-store before midnight of August 12th which was when the price drop kicked in "officially". Anytime after that and it is too late.
Oh yeah, I did that. As you probably already know, Nintendo posted a new update in the eShop-- they're launching a site this week so that we can confirm that we are in fact Ambassadors.