PowerA Joy-Con Comfort Grip for Nintendo Switch (no price)

If you love Nintendo Switch, you're going to spend a lot of time playing it. The Comfort Grip brings the left and right Joy-Con Controllers together to make one comfortable controller, so you can play as long as you like.
Ergonomic, rubber grips will keep your palms happy and your fingers from cramping at home or on the go. Simply slide each Joy-Con Controller down the rails until they click, and view the player indicator lights through the front.
ProTip: the Comfort Grip stands up on its own and looks great next to your Nintendo Switch Dock.