Ariana Grande Tonight

My friend and I really want to go tho the Ariana Concert tonight. We planned to get last minute tickets because we want the prices to go down. We will only buy from ticketmaster and I’ll be at the box office all afternoon. This is our childhood dream to go see her except we’re kind of broke rn💔 our budget is not more than 100$. Anyone has any tips to get those tickets ? Please help me! Thanks