Silver Games sells their Ponyfinder books through DriveThruRPG. DriveThruRPG is having a huge sale on Pathfinder and Pathfinder-related materials. Ponyfinder is Pathfinder-related. Therefore, Ponyfinder materials are on sale over on DriveThruRPG. Pretty straight-forward this story is.
From the announcement:
We have a huge sale going on at DrivethruRPG and you're cordially invited! Up to 70% off most books!
It doesn't get this good very often, so snap up a deal while you can.