Tweeter today announced that it has launched an iPod trade-in program at all 153 Tweeter stores nationwide. Customers at the electronics retailer will receive instant store credit when they trade in their iPod. After a customer brings in an iPod, a Tweeter sales associate will use an “iPod calculator” powered by NextWorth to provide a trade-in value for the iPod. The customer will then receive credit towards a new iPod or other products available at Tweeter. The value of the customer’s iPod is “commensurate with its condition and its demand in the marketplace,” according to Tweeter.