KEH (keh.com) may have some used ones from time to time. Also try Wings Camera (wingscamera.com), a smaller shop, but I have bought some used ones there before. Both are also in Atlanta, Georgia!
I have many used ones I can sell if you're interested but shipping from the USA may be cost prohibitive. Do you want wooden or plastic? How many do you need? Do you have a preference regarding brand?
I have some nice ones I can sell fairly cheaply but the shipping cost may be a deal breaker. I'll weigh them and let you know.
Mike
EDIT: Just checked the US Postal Service website and it looks like shipping will be $40US. I can sell six nice plastic holders for $100US so the total is $140US. Please PM with your email address for pics. Of course, APUG will receive its share.
Mike,
Many thanks for your trouble, but as you say The postage is too high unless I get very desperate!
Keeds,
I look foreward to getting more details from you. I could do with quite a few, say half a dozen if possible.