An immersion blender, it was $30 but it made my soups seem gourmet and let me recycle my gallons of lard into the best soap I have ever used.
Aside from that, I replaced two of my mismatched odd shaped PC monitors with 27" 4k monitors and the difference is amazing. The monitors were so cheap too only $110 each. Together with my super fancy main screens it really cleaned up the desktop.
I love this video so much but his entire channel is amazing.
The running of a super Nintendo game on Nintendo is batshit insane. This guy understands computer science and engineering in a way that makes it just seem like magic to me, and I'm a computer scientist who works as an engineer.