try

Discmakers
Evatone
Media Fast (mediafast.net)

they could point you in the right directions - in all honesty, I don't see the little round stickers being used any more, it's all security stickers along the spines.

You could try some round binder stickers from Office Max or something along those lines.

cheno

if you have time, clear packing tape slices longways works well.

Video game stores don't put out the actual video games any more (many never did). They have an empty case & you go to the counter & say "I want X". That works pretty well.

I just started using clear plastic bags (with seal) to give my DVDs a "shrink wrap" look. Its a little labor intensive but it looks nice. In your case, it will act as a security measure.

http://www.meritline.com/dvd-cd-cases-wrap.html

The right way to give your CD's or DVD's totally professional look. Requires no special equipment. Just slide the item in and you're done! The film wrap is clear so that your case and/or label will show through.

These are not round but may look familiar....
Security Device Enclosed

Our public library uses a core ring label that works with the
entry security station. Don't know who makes it but you must
magnetize ??? it before handing it to the patron or the entry station
beeps when you pass through it.