I hope that this hasn't been posted yet... I was just at Maxi in Laval, Quebec (Maxi belongs to Loblaws and I think it's the same as Superstore in the rest of Canada) and I found the Styling Luna/Celestia Canterlot combo pack, as well as the other Canterlot set where the ponies are dressed up in gowns (Royal Ball at Canterlot Castle). They looked like they had just arrived, since the shelves were pretty full. They're pretty expensive though (32$ for the Luna/Celestia set, not sure about the other one) but I was pretty happy to see them here in Quebec!
They also had other Target exclusives like Shine Bright Fluttershy and Pinkie Pie and Celebration at Canterlot Castle (with Starbeam Twinkle)!
I'll have to go back and buy some