I've looked at a few online stores but thought I would look for recommendations.
I know you can get them at Micheals Craft Store (here in Canada)that's where I usually buy mine. I'm sure you could get them there in the US too.
Global Sugar Art is a very good company to order stuff on line. There was a recent thread here in the forum about them. Most of the posts were positive feed back. Personally, I love the company. Everytime I call the phone, I speak to a real person. If I order my stuff at 5am, there's an e-mail at 1pm telling me my order had been shipped.