Some of the cardboard CD album covers come with translucent plastic sleeves for the CDs, similar to the plastic sleeves made for LPs. This seems to address the scratching problem.
Sleeves like this are available in the after-market at about $0.04 per.
http://www.sleevetown.com/plastic-cd-sleeves.shtml?google=cd-sleeve
However, I have not yet purchased them, so I don't know whether the fit is tight enough to fit inside the cardboard.
Sleeves like this are available in the after-market at about $0.04 per.
http://www.sleevetown.com/plastic-cd-sleeves.shtml?google=cd-sleeve
However, I have not yet purchased them, so I don't know whether the fit is tight enough to fit inside the cardboard.