Apple has begun to offer refurbished units of the fourth-generation iPod nano through its online store. Available in both 8GB and 16GB capacities, the players are available in limited colors—six for the 8GB models and eight for the 16GB units. The players carry a one-year limited warranty and sell for $129 and $169, respectively. Reporting its fourth-quarter financial results, U.S. iPhone carrier AT&T announced that it activated 1.9 million…
