Arrowroot powder (or flour) is derived from the root of a tropical plant called Maranta arundinacea. It can replace corn starch as a thickening agent, but it is not derived from (often genetically modified) grains, and is obtained through a more natural process. Arrowroot powder can also be mixed with other flours for gluten-free baking. And it has multiple health benefits!
Try it for $4.67/lb (in bulk).
More information: https://downshiftology.com/5-things-you-need-to-know-about-arrowroot-powder/