Very affordable (and app-usable) fonts

I just had to license a font I’ll use in a book project I am working on in my everyday job. Having seen the question for fonts usable in apps too, the designer just told me this is perfectly fine with her.
Most of the fonts will not be the right ones for a business app, they all carry a distinctive female touch. But many would fit great in games or apps for children.
http://bythebutterfly.com/myfonts.php