Candied flowers are pricey-even from online sources. I am told by someone who knows about such things that this is the case because they are fragile and difficult to ship. But they aren't that hard to make if you have a good source for the flowers--such as the greenmarket in Union Square.
The candied petals are less expensive, and depending on your end purpose, may work well.
I would also try Broadway Panhandler on W 8th st.
I hope that this is helpful to you.
Union Square Greenmarket
Broadway and E 17th St, New York, NY 10003
65 E 8th St, New York, NY 10003
Using the search engine GOOGLE, found this old post from this very site. Though from 2002, some of the places are still in business. It mentions NY Cake and Sweet Life. Worth some calls.
The Sweet Life
63 Hester St, New York, NY 10002
New York Cake and Baking
56 W 22nd St, New York, NY 10010