Got it. But having the buttons still say "$19" sounds pretty damn dishonest and manipulative to me. The buttons should really say "5 rides ($X.YZ)", "10 rides

Got it. But having the buttons still say "$19" sounds pretty damn dishonest and manipulative to me. The buttons should really say "5 rides ($X.YZ)", "10 rides ($X.YZ)" or whatever and compute the exact amounts for the user.