Through September 28, you can get a free full-size pack of Actual Veggies burgers via a cash-back rebate. Simply enter your phone number here, purchase a pack of Actual Veggies from your local retailer, and they'll Venmo you back the full amount.
Here's a store locator to make sure they sell these nearby.
These are vegetarian burgers that are also vegan, gluten free, and kosher. You can learn more about them on their website here.