I ended up going back today and getting Super Mario 3D World and DKC: Tropical Freeze to go with the Mario Kart 8 copy I got yesterday. While I barely got out with Mario Kart because of a savvy manager who lectured me, this time it was smooth sailing. I made some friendly banter during the price checking, and then applied my reservations along with some other things I was buying. I was actually a little surprised the girl helping me didn't seem to notice as she rang things up and the price went down. Given the rumors that Target sent out an email not to allow people to use this combo, I felt a little bad walking out. I didn't want her to get in trouble if the manager was to go through her transactions later.
Hopefully that won't happen. And I got a great discount. Knowing Nintendo, these games will be no less than $30 even 3+ years from now, if that, so I had to jump on while I could.