I found out the same thing on my trip to Trak Auto after forgetting to buy a filter from the dealership across the street.
And don't forget the Trak Auto brand is M4460
The funny part is that I think that's the same filter my Civic used. So the one or two I have tucked away somewhere for my civic I no longer own can now go on my WRX.
And changing the oil on this car is the easiest I've ever experienced (aside from my truck which was easy because you could slide under the truck without jacks). All of it is accessable from the front of the car, no jacks, jackstands, etc needed.