Just used my DoorDash voucher that I got from the little birdie website (Use another voucher but used a different email address this time) and managed to get 2x Large Big Mac meals delivered for $12.95
To get the free voucher, claim it from http://www.littlebirdie.com.au, it says it takes 48 hours to receive the voucher but mine was sent almost instantly.
Voucher items are "50% Off Your Order and $0 Delivery. Save up to $15: Offer valid from 10/11/2020 to 31/12/2020. The maximum value of the discount from using the promo code is up to $15 dollars. Limit one per person. Other fees may still apply. All deliveries subject to availability. Must have or create a valid DoorDash account with a valid form of accepted payment on file. No cash value. Non-transferable. See full terms and conditions at help.doordash.com/consumers/s/article/ offer-terms-conditions."