Unless you need a wireless one, new Wii U consoles come with the Wii Sensor Bar.
Nintendo sells refurbished wired sensor bars for $7.50
https://store.nintendo.com/ng3/us/p...false&productId=prod10566&categoryId=cat10020
Buy a pack of rechargeable eneloop AA batteries for the Wii Remotes and reuse them for anything else that uses AA batteries.
http://www.amazon.com/dp/B003VLAEPQ/?tag=neogaf0e-20
Nintendo also sells refurbished Wii Remotes ($13), Wii Remote Plus ($15), and Nunchuk ($10) controllers.
Wii Remote - $13 refurbished
https://store.nintendo.com/ng3/us/p...false&productId=prod10447&categoryId=cat10008
Wii Remote Plus - $15 refurbished (NintendoLand, Zelda: Skyward Sword, Wii Sports Club + future Wii Remote Plus game releases)
https://store.nintendo.com/ng3/us/p...alse&productId=prod400003&categoryId=cat10008
Nunchuk - $10 refurbished
https://store.nintendo.com/ng3/us/p...false&productId=prod10023&categoryId=cat10008
Required controllers for downloadable Wii games
Wii Remote + Nunchuk required (with Sensor Bar)
Super Mario Galaxy 2
Metroid Prime Trilogy
Sin and Punishment 2
Pandora's Tower
Donkey Kong Country Returns (analog stick nunchuk + motion controls)
Punch-Out!! (motion controls)
Wii Remote only (with Sensor Bar)
Kirby's Return to DreamLand (Kirby's Adventure Wii)
Punch-Out!! (NES controls)
Donkey Kong Country Returns (NES style controls)
Wii Remote + Classic Controller/Pro (optional)
Pandora's Tower
Sin and Punishment 2