I have a small DJ CD case with 3 dividers - it holds about 120 CDs - with a hinged lid that comes off. I have 13 titles for sale so that's approx.9 of each in the case.
I prefer it if people don't paw through them because they usually put them back in the wrong place.
So I have 9 or 10 Laminated cards with reduced pics of the all CD covers (both sides) along with the song lists, which I hand to folks to peruse while in line.
By the time they're ready to buy, they have their mind made up, and I can pull it out of the case.