Best way to buy (day-of) cheap last minute game tickets?

Apparently theirs a soccer game, Mexico v. Jamaica at the NRG stadium this Saturday. I don’t want to spend a couple hundred on two tickets so was hoping some app/websites could help with it since I know some ppl ditch their tickets last minute to recoup some of their money. Best apps? Best times? Ppl reselling tickets outside the doors? What the cut-off time that you can buy a ticket on the app to go in?. Any tips are greatly appreciated