Yes, that is a good price. 4 day PH for adults sell for right around $200 here, give or take a few dollars either way.
In fact, that is SUCH a good price, that you may want to be very very careful to make sure the tickets are legitimate tickets (and still have all 4 days remaining on them). If its for real, well then, bonus for you! But I'd be careful, you know the saying, if it sounds to good to be true, it usually is.
Best of luck to you!