You can spend these at any Carnival game in the world CARNIVAL, if the Carnival happens to be in town.
Golden Ticket price in Growtopia: sells for about 20/WL (median of 7 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: GACHASHOP101, CLEARWAS, PVMOC, RMCGP, GFUN