Lots of options if you’re looking to buy a Roku Streaming Stick® 4K (2021) Streaming Device 4K/HDR/ Dolby Vision with Roku Voice Remote and TV Controls for only $29.99. There are options for less if you don’t need or want a voice remote. Here’s some links:
Amazon because, obviously!
Best Buy has two choices.
Target has a nice selection.
Walmart is part of the group as well.