This deal has ended.
Likely for today only, Buy.com has the Wii AirCharge Inductive Recharging Set on sale for only $18.29. This includes two rechargeable batteries and the charging station (you don't even need to take the Wii remote's cover off to use this), features a built-in timer to prevent overcharging, and is the best price currently available anywhere for a set of this nature. Plus, shipping is free and there is no sales tax (except CA, MA, MD, NY, TN). If you're buying two, you can get an additional $5 discount by signing up for and using a new Google Checkout account.