I would like to share a link for anyone looking for suppliers for their commercial/large scale aquaponics ventures (or any size, really). I have to give credit to Purdue University and the Indiana Soybean Alliance for creating these lists. Note: these lists tend to be focused on the midwest but if you know of a supplier, please encourage them to ask to be placed on a list.
If you delve deeper into the site you can also find a business startup plan for an aquaculture venture, which I'm sure could easily be tweeked to fit aquaponics.
Have a great day!