Forking over $15 or $20 for a new CD these days puts a dent in the wallet of many music connoisseurs. Thankfully, there's Half Price Books. Here, you can find used CDs of mainstream artists and popular indie acts priced anywhere from $5 to $8. Lesser-known artists show up on clearance racks, priced from $1 to $3 -- and music collectors should take note of this section. Between all the music that some might say isn't worth a dime, there are out-of-print gems that have gone undetected by the populace for months, many of which go for a lot more on eBay.