If you haven't been following the recent news, Equestria Girls Mini will be playing host to a plethora of new sets this and next year. Photo Finish and Pinkie are already making their way into stores over in Singapore. Usually when this happens, worldwide release is right around the corner. Right now we expect to see the following in the next few months / early next year:
Rockin Equestria Girls Mini Singles
Play Sets: Principle Celestia / Science Twilight, Photo Finish and Others on Amazon
Rainbow Rocks Figures
Chances are those Amazon links will be your best bet.
Thanks to Ryan for sending it!