The Big Arch is part of the Burgers range on the Macca's menu in Australia. Two Aussie beef patties, three layers of white cheddar, crispy and slivered onions, pickles, lettuce and Big Arch sauce on a sesame and poppy seed bun. Available after 10:30am. As a guide, expect to pay around $12.40 in-restaurant, though prices are set by each franchise and vary by location.
For the most accurate, store-specific price and availability, check the official McDonald's app or your local restaurant.