If you haven't made a trip to Gamestop yet for the Power Ponies figures, Funko has uploaded them over on Amazon for purchase online. You have two specific options:
Singles at $6.99
Set at $79.99
We also have a report that the toys are starting to appear at a store called "2nd and Charles", though that might be a bit more niche than just hitting Amazon.
Thanks to Jyro and Jeffrey for sending it.