Food Directly from the Farmer:
VitaCost
They carry a huge variety of foods including many gluten-free and other special diet friendly options, have generally low prices, very fast shipping, and have sales going pretty much all the time. They also have a good selection of supplements.
Thrive Market
They have a smaller selection than VitaCost does but are more special-diet focused and have some products at really low prices.
Azure Standard
This is a company that offers a variety of health-oriented groceries, which are ordered online and then delivered to a local drop site by semi truck according to a route schedule.
Natural Candy Store
You can search their offerings by type of diet (such as Feingold, vegan, gluten-free) or by allergen(s) to avoid.
Meat and Seafood:
US Wellness Meats
Northern Canadian Bison Ranch
Vital Choice Seafood
Iliamna Fish Company
This is a CSF (Community Supported Fishery, a model similar to the CSAs that many people are aware of. They have four locations where shares are available. We've bought shares of their fish and it is very good!
Camel's Milk:
Desert Farms Camel's Milk
Starter and Supplies for fermentation and cultured foods:
Cultures for Health
Gluten-Free and Casein-Free
GF/CF and non-gmo pantry staples from Autism Coach
Herbs and medicinal ingredients:
Mountain Rose Herbs
Organic alcohol