There are actually several stores on property that sell Chamilia charms, and not just at Downtown Disney. Main Street Emporium has a big selection, but they frequently run out of sizes for bracelets, and they usually try and talk you into getting a bigger size, which is what they did to me, and I haven't been able to wear it, so it collects dust in my jewelry box. It may have been a better fit had I put more beads on it, but I don't care for Chamilia at all, and much prefer Pandora, so my beads are on one of two Pandora bracelets. I so wish Pandora had the Disney contract!
Just a warning - not all charms are interchangeable. When I was looking at the Disney charms in March, a women purchased a charm, and it would not fit her bracelet, so they let her return it on the spot. She wanted to try it before they rang her up, but the salesperson said they would all fit, and I told her they may not, and so she was disappointed. I can't remember which charm it was though?
Another word of warning - the Murano glass Mickey head chipped immediately, as it's a raised design. Chamilia said I could return it, but the new one will just keep doing the same thing anyway. Just wanted to warn people of this design flaw.
Incidentally, the prices for Pandora charms are set by Pandora, but not sure about Chamilia? My charms that I purchased on Main Street were the exact same price as online, but perhaps they run promos like Pandora does?
Happy shopping, Tiger