The coupon industry in Australia is still lagging behind other developed markets like the US and UK. Coca-Cola is credited with introducing the first coupon in the late 19th century. While coupons have been printed on grocery receipts in Australia since the 1990s, grocery couponing remains underdeveloped. Most Australian coupons now come from online retailers. Key challenges facing the industry include an underdeveloped affiliate network, a lack of digital marketing experience, and a lack of coupon distribution platforms and dedicated coupon websites. Currently, TopBargains is the leading Australian coupon site, listing deals from over 1,800 stores. If coupon usage in Australia reaches levels seen in the US, the industry could be worth billions annually.