UPDATE: There is a new version of Billy, now with improved kerning, and a ton more glyphs! Available here.
Billy is free to use for personal use non-profit causes (download here), but to use him commercially you've got to pay. You can pay any amount you like, so please consider what you'll be using him for and how much value he'll give you in your project/s. Once you've purchased Billy, you can download any future versions at your leisure for no additional cost.
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You'll get 1 font & 1 very interesting license document