We no longer offer a replacement remote for the Roku Streaming Stick model 3500. However, we would be happy to see what we can do to help get you back up and running.
Please feel free to send me a PM with your Roku account email address and the serial number of your Roku device (printed on the side/back of the device) and I'll have our support team reach out directly to assist you further. Meanwhile you can use the free Roku mobile app as a replacement remote control.
You can get the 3810 stick+ for $29.99 this weekend almost anywhere. It comes with regular voice remote, roku sells the enhanced voice remote with headphone jack for $29.99. third one down on this page: