DestinationCoupons offers an adult ticket to The San Francisco Dungeon in San Francisco, CA, for $13. (Select "Click Here For Coupons" to see the coupon.) That's $9 less than booking this ticket directly and the lowest price we could find. The coupon must be printed or displayed on your phone and presented at entrance to the exhibition. Some restrictions apply. Book this travel deal by April 30.
Of note, you can also get a Child's Ticket for $10, a price low by $6.