Price
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The RPN-45 is commercial open source and available through the following on-line shops:
| Shop | Operating System | Price |
|---|---|---|
| Android Marketplace | Android | €2.98 |
| Sourceforge | Windows, Linux, macOS | Gratis |
I stopped selling by Paypal. It is to much work and one overlooked e-mail gets into much trouble. I also stopped using any any alternative shop. More trouble then it is worth.