Microsoft Store offers the Technocel TYLT Energi Travel Charger for $19.97 with free shipping. That's the lowest total price we could find by $14. It features an 1,800mAh battery, embedded microUSB charge cable, and fold-away AC prongs.
I've been giving financial advice for 40 years, and I'm a millionaire several times over. Here are the 10 best bits of financial advice I've both given and taken.