If you're in need of oat flour, you might not have to run right to the grocery store. Put your certified gluten-free oats in the blender and you'll be on your way to a quick-and-easy gluten-free flour alternative.
If doing the homemade thing isn't your style, you can always purchase gluten-free oat flour or find a gluten-free flour blend alternative, like this cup-for-cup line from Silvana Nardone of Silvana's Kitchen. Be sure to buy flour that is labeled or (preferably) certified gluten-free, as cross-contact can easily occur during the harvesting and manufacturing process of both oats and flour.
For tips on converting gluten-containing recipes to gluten-free recipes, head to SheKnows.com.