How much is Roku's monthly bill?

Excuse me, could you please clarify the nature of your inquiry? Roku is primarily known as a streaming device and platform, not a service that typically charges a monthly bill. Instead, Roku users typically pay for individual streaming services or subscriptions like Netflix, Hulu, or Amazon Prime Video, which have their own monthly fees. Could you be referring to the cost of a specific streaming service that you might access through Roku? If so, could you please specify which service you're interested in? That way, I can provide a more accurate answer to your question.