This app was mentioned in 2 comments, with an average of 2.00 upvotes
Download and never make this mistake. I hopped a train downtown in Houston for 1 stop (~2 minutes) and my ride went from $120 to $35.
https://play.google.com/store/apps/details?id=com.habosa.nomoresurge&hl=en
Never tried it, but will this week.