Ask HN: Where do people sell apps these day?

Hey folks, I made this app called "GalleryGrouper." It's a cool tool that lets you sort out all those photos you've got. You can tell it how many folders you want and how many photos go in each. So if you've got 100 pics and want them in 10 folders, it'll do 10 photos per folder for you. And if you're in a fun mood, there's a "Random Distribution" option to shuffle them up! I'll add more organizing features in the future, but for now this is what I got.

Any thoughts on where I could sell an app like this?