Greetings @HCooper89
Welcome to the Roku Community and thanks for posting regarding your inquiry of additional chimes for your Roku Smart Home Doorbell.
Unfortunately you cannot purchase additional chimes for your Roku Smart Home Doorbell at this time.
If you have another inquiry in the future, please don't hesitate to post again in the Roku Community.
Happy Streaming,
Danny
Danny R.
Roku Community Moderator