Beef jerky tends to have soy sauce or teriyaki sauce, so it is hard to find GF beef jerky.
When I crave protein, I buy Trader Joe's Organic Beef Jerky "Original" flavor.
It is $4.99 for 3 ounces of jerky (33 grams of protein and 210 calories).
It says "Gluten Free" on the lower right corner of the green bag. (see picture below)
It does not feature the TJ's gluten free logo, so you may have overlooked it.
Beware, some other flavors by the same company contain gluten, so read carefully.
It tastes good and makes for a great snack to help you make it to the next mealtime without passing out or being overly cranky.