When you are browsing through the UrbanLISP app store you may come across the 'social download' stamp. When you see the social download stamp it's possible to download that command for free. All you have to do is 'Like' the command on Facebook or Tweet the command on Twitter. After you shared the command you will be able to download the command. It will work for a few months. That should be enough time for you to try it out and see if you like it.
When you click the commands button above and check out the command categories you will see there's the social download category listed in the bottom. Click it and you will see all available social downloads. Every month the social downloads will be refreshed so you can try out new commands frequently.