CheapTickets via goSeek offers a Halloween Stay at Knott's Berry Farm Hotel in Buena Park, CA, with prices starting from $78.20 via coupon code "VACAY18". (We found this rate on October 30.) That's the lowest rate we could find for a Halloween stay by $17. This 3-star hotel has an Expedia rating of 79% based on 2,908 reviews and has earned the Trip Advisor Certificate of Excellence.