Hopefully someone has something more specific for you, but I know that on the Virginia side there are a ton of Asian grocery stores, and one which I think is a chain, which is called "H-mart" and has a giant version too: http://www.goldsea.com/Parenting/Malls/superh.html Maybe they have stores in Maryland too? If not, Chinatown in the city for sure would have little grocers that would sell them. I always just bought them at My Organic Market, which is my favorite grocery around there, and I know they have stores in Maryland, as well as Whole Foods, which of course are everywhere.
Gail's is no longer in business, but Kit Wood, of Green Plate Catering, worked with Gail and specializes in vegan and vegetarian food. I've been to several weddings where she has provided food that not only tastes exceptional, but is visually stunning. Ask her about the cornucopia table!