Hey, there are several different license levels for CSP. There is only one tier of free version and its for non commercial use at 50 nodes. For our paid versions there is a 50 node version, a 100 node version, a 200 node version and an unlimited node version at different price points. I'll attach a link where you can see the different price points if you click the buy now button.

https://www.nagios.org/upgrade/