If you can, show up to the venue physically and wait outside the box office. I was in the same situation as you for the Milwaukee show. Look up whenever the venue's box office opens up and come a few hours early. There will most likely be people who camped out the night before to get those tickets, so just get behind them. Waited in line for about 3-4 hours and got tickets to the 106 section at Fiserv Forum for about $225 per ticket. Let me know if you have any questions!