I can't find 4:3 monitors, only 5:4.

I swear to gourd I had NEVER SEEN a 5:4 LCD monitor in my entire life as a child but now that I want to perfect my retro setup the ONLY MONITORS I can find at thrift stores are all 5:4. Like why. Who is responsible for this. I don’t want to spend all the money on shipping a monitor from ebay but I’m losing it.