Welcome to the Roku Community and we're sorry to hear about your Roku Streaming Stick.
You may purchase a new Roku device directly from our official Roku website: Roku Players | Roku
We also recommend taking a look at our Support page for more information regarding what to do if your Roku device is lost to secure your Roku account: What should I do if my Roku® streaming device is lost or stolen? | Official Roku Support
Let me know if you have any other questions, and have a good day!
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There's also stores such as Best Buy or Walmart, online from Amazon, and potentially other local stores. Almost anywhere you find TV and audio equipment sold you'll find Roku players.