Wholesome Sweeteners
This site sells organic, non-GMO corn syrup, sugar, and stevia.
Barry Farm
At this site you'll find reasonably priced high quality natural candymaking ingredients, including candy colorings and flavor oils.
An Occasional Chocolate
Great resource for organic chocolate, raw chocolate, and sugar-free chocolate.
Flavorganics
This site carries a wide range of organic flavorings and extracts.
Maggie's Naturals
This company sells all-natural, gluten-free food dyes.
Swerve Sweetener
Swerve is a natural sweetener that does not raise blood sugar levels and has a 1:1 ratio to regular cane sugar.
Confectionary House
Look here for candy thermometers, candy cups, candy boxes, and much more.
Vitacost
You can find unbleached parchment paper here, and you can also search specifically for non-GMO ingredients.