Downtown Melbourne Botanical Fest vendors, from their Facebook page:

Vendors Sponsors:
Valkaria Gardens
Hopkins Nursery
McCrory's Sunny Hill Nursery
MB Palms.  They're from Orlando, have brought good (and interesting) plants to Vero Gardenfest, including Lytocaryum, a great little shade palm.

Vendors: 
B and B Exotics Plumeria
Bill Cook's Decorative Glass and Things
Buddah's Garden
Cool Roses, Inc.
Conradina Florida Native Plant Society
Chapman's Orchids, Exotics, and Aquatics
Craftworks
Deerpark Concrete
Eden Paradise Gardens
Elemental Nursery
Emerald Island Nursery
Edgewater Shop
Exotica Tropicals.  Paddleout.
FarmDaddy
Fancyleaf Caladiums
Florida's Finest Raw Honey 
Gardino Nursery
Going Bananas
Green Gables at Historic Riverview Village
JG's Tropical Plants
Jim's Orchid Supplies
J and P Nursery
Magic Nursery
Our Vital Earth, Inc.
Perfect Fit Planter
Peters Croton and Cordylines.  I finally got a croton this year.
Pond Science, LLC.  They do garden ponds.  Made a good impression at Gardenfest.
Randy's Bromeliads and More
Simply Organic Lawn & Garden Center
Tower Garden