Barnes and Noble today introduced its Nook Wi-Fi device priced at $149. In addition, the 3G version of the Nook has been lowered to $199. The company notes that the new Nook 3G price marks the first under $200 dedicated full-feature eBook reader that offers both free 3G wireless and Wi-Fi connectivity. It also now has a new software update that is supposed to make it easier to connect in more places via Wi-Fi.