Opening in 1998, Second Spin is the largest company of its kind on the internet. It buys and sells used CD's, DVD's and games. Its products come from three sources: the internet, the retail stores and from brokers around the country. It has a wider variety of music and movies than other used sites. Its strict quality control keeps the defect rate very low, so everything is 100% guaranteed. If you buy 3, the 4 th is free.