You can purchase used Roku tv remotes for under $10, either Sharp or Hisense Roku tv remotes will work, no other roku brand will.
You can go to Walmart for either Wifi voice remote once paired with your tv will work fine. They also have the One-For-All urc-7935 Streamer universal remote works great with Roku tvs. Use Section D to program the Roku tv. Is $16.88 at walmart. Here';s photo next to the Roku tv voice remote: