It's like anything you buy. You've got shop around for pricing (if that's your main concern) or quality (which you're going to pay a premium for) or style (if you like it, you'll pay extra to have it.)
Indeed. While I personally feel Detecto's posts are puerile at times, I'm certainly under no obligation to read them - yet I still do (guilty pleasure, I suppose). At any rate, this particular thread is certainly on topic - it is a coin ring after all.