My roughly equivalent US plan on AT&T is ~10x that.
Don't get me started on the international. $60/GB for a pass or insanely $2,050/GB pay-per-use without a pass [1]. The rate is higher than that in some cases too [2]. It really should be illegal. Of course this is on top of the normal data plan charge.
They also have another day pass plan for $10/day that allows you to use your normal data plan internationally [3], however, only a subset of AT&T plans are eligible for it.