Is there a monthly fee for a router?

Excuse me, could you clarify if there is indeed a recurring monthly charge associated with owning and utilizing a router for internet connectivity? I understand that some services may bundle the router cost within their subscription plans, but I'm particularly interested in knowing if there's an additional, standalone fee that customers need to be aware of for simply owning and maintaining a router. It would be greatly appreciated if you could provide some insight into this matter.