Power A Enhanced Wireless for Nintendo Switch
If you're looking for a third-party wireless controller for your Nintendo Switch, then you may be interested in learning about PowerA's Enhanced Wireless Controllers.

These are apparently the first officially-licensed wireless Switch controllers released.

Pre-orders start at $49.99 (USD) and come in a variety of colors. They also feature a few additional buttons that you can map additional actions to, sort of like the Xbox One Elite controllers.
PowerA Enhanced Wireless Controllers for Switch provide gamers:
Reliable wireless connectivity – enabled with efficient Bluetooth™ 4.1 technology, the controllers provide a virtually lag-free experience. No pesky adapters or dongles needed.
Integrated motion controls – PowerA Enhanced Wireless controllers are now motion-friendly, enabling a more authentic gaming experience.
Advanced gaming buttons – Does having to click on the analog stick while running slow you down? Now you can gain a competitive advantage and “play your way” by mapping additional actions to either button on the back of the controller.

Additional Features and Specifications
• Bluetooth wireless
• Integrated motion control
• Advanced gaming buttons
• Officially licensed
• Battery warning indicator
• 2-year warranty

Apparently they also have some wired ($24.99) and wireless ($49.99) GameCube style controllers coming soon that can be used for the Switch. I'm assuming these will be popular among the Smash community.

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