All downloads are available for free. Still I would be very exited about any contribution to be set free to even touch more hearts.
The given prices are only for your orientation. You can give as much as is suitable for you or bring in your very own mesurement. Of course you can also sum it up with some tip.
Bank account: Samuel Meerstetter, CH-6300 Zug, CH74 0900 0000 6165 4846 8