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