Roku has no monthly fees of their own. If you subscribe to channels via your Roku, Roku is just acting as an agent collecting the fees for the channel.
I know of no discounts, but maybe a Roku employee will see this and give you a definitive answer..
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X