Who's your provider if you don't mind me asking?
But there are other MVNOs out there like tello which also have a 2GB/$6 plan in the US, and other MVNOs which offer unlimited data for like $25-30/mo like visible and US Cellular.
Plenty of cheap MVNOs out there these days.
I'm not a good case study because I rarely use more than 2gb in a month, so Mint would come closer to $10 a gig... :)