If you're interested in sources close to home, check your local farmers market and calling your local nurseries, I'm sure you'll be able to track down some providers in your area. Edible flowers may also be found in the produce department at some grocery stores
Another option would be to consider growing your own. Most of them are very easy to grow and you can beautify your living space at the same time!
Are you looking for any varieties in particular?
In addition to the sources mentioned above, here are some more for you: