Hello fellow Ebay'er and welcome to my "How to pack & ship CD & DVDs without a box" guide. As a long time seller I've used this method of packing for all my international and/or media rate mailings and it has saved me money on boxes plus I've never had a disc get there broken. And you can easily fit in up to three discs.

It's very simple, all you need is wide 'not invisible' tape, some bubblewrap and two pieces of heavy cardboard, one for the top and the other for the bottom.. For CDs with the case they have to be 5-1/2 by 6-1/2. For DVDs make them 6 by 8.

Now a short lesson on cardboard. It's made out of two sheets of thick paper glued over a ridged corrugated center. To make this package strong you need to place one sheet of cardboard with the corrugation going "up and down" and the other "left to right"

 
First wrap the disc(s) in some bubblewrap and tape it all the way around, both "up and down" and "left to right."

Then tape the whole thing onto one of the sheets of cardboard.

Now place the other sheet, with the corrugation going the other way and tape the whole thing together.

Now comes the fun part. Tape all around the edge on all four sides with the wide 'not invisible' tape. And that's it.

 
And don't forget to check out my other guides -- "How to pack 45 RPM records in a Priority mail box" and "How to pack LP records in two Priority mail boxes" and the most important one "Why ABBA, as a group, is the anti-you-know-what and should be destroyed" ... OK, that last one was a joke.