Used CDs have just been added to the list of goods accepted by Amazon.com's Trade-In program, Smartmoney reports. On Wednesday, the online retail giant announced that users can mail in used CDs in exchange for store credit. Amazon's trade-in program has previously accepted a variety of media and electronics including books, movies and video games. The site collects eligible used titles from customers and resells them to third-party merchants.

If anything, Amazon's new CD trade-in program underscores impressions of the compact disc format's declining value. According to the site's estimates, a used copy of Madonna's new album, MDNA, will trade for up to $5 – a little more than enough to buy five tracks from the album on Amazon MP3 – while Skrillex's Bangarang nets a measly 65 cents.

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