This deal has ended.
Shop4Tech.com still has the Wii Twin Charger Stand with Rechargeable Batteries on sale for $20.95. Enter 10% off coupon code AB10 (expires 7/31) and lower it to just $18.85. These allow for up to 25 hours of game play per charge, and unlike other charging stations, connect via USB. Shipping is free and there is no sales tax (except CA).