Gluten free twinkies are still available, at least for people who are willing to make them at home. If you are particular about the traditional shape you will need to purchase one or more “canoe pans” from a local supplier.
Here are three recipes. Strictly speaking, none of them are gluten free. Each recipe calls for a box of cake mix of a specific size — It does not seem to matter which grains are involved. Therefore, shopping will not be difficult. Since the titles of the articles are almost identical, I will simply refer to them as this one, that one, or the third one.
Enjoy your snacking!