To be honest you probably can't - a site was mentioned last year but from memory that was wholesale only. Really you have to make the decision buy caddied media or not. Besides if you have caddyless DVD-RAMs they probably have a protective coating on which would prevent their operation in a caddy.
Just thought I'd drag this one back up, to see if the situation had changed. I can usually remember to pick things up and move them out of reach before little fingers get to them, but there is always that "missed" disc.
So does anyone know now in 2005 (almost a year later of the original post) of anywhere to get "empty" caddies.