You can pick up a universal AC-USB charger pretty cheap these days almost anywhere. Don't pay more than $10. Even a fairly small one would suffice to recharge the Kobo. If you need portable power, look into one of the battery-powered USB chargers like
http://www.dealextreme.com/p/aa-batt...ger-pack-15048 or
http://www.dealextreme.com/p/2200mah...le-black-44914. I carry one when I'm traveling with the Kobo in case it runs out of power during a long trip and there's no AC adapter nearby.