How do you get Robux on Roblox without buying it or buying Builders Club

The only way to get Robux on Roblox without buying it from the Roblox Central Bank or buying Builders Club is to go to the Roblox Exchange and trade your Tickets in for Robux. You can do this by clicking on your tickets counter on the Roblox website and then clicking the "trade currency" link on the right.