Nice error! Keep it protected. I don't know its value, but get it to PMG for authentication, grading and encapsulation. (If it's real) you'll get a better premium that way. Based on a recent thread here on CT, PCGS Currency might not be a good choice right now.
Errors don't have specific prices like nomal currency usually does. I would think it should be worth at least 2 to 3x face, since its a large error and in good condition.