Orzly Nintendo Switch Screen Protector 2 Pack - $8.99
The Orzly Nintendo Switch glass screen protectors come in a two pack and are super thin. These are tempered glass so they protect from scratches and from some drops without cutting into touch sensitivity.
If you drop the Switch, you may break the protector, which is one of the reasons you should install them. The protector is edge to edge, so it will keep the whole screen safe. There are small notches for the edges where sensors or edges are.
These are fingerprint resistant, so you're screen will be easy to use without wiping it every 20 minutes.