There are several websites that offer coupons to the Denver Downtown Aquarium. Coupons can be found on coloradokids.com and yipit.com, There are also several discounts and deals available on aquariumrestaurants.com.
Coloradokids.com offers a printable coupon for a $6 Kids Exhibit Pass with the purchase of an Adult Pass, as of January 2015. However, this coupon is not valid with any other promotions.
As of January 2015, yipit.com offers 53% off one adult and one child's ticket to the aquarium.
Aquariumrestaurants.com details how to receive a 10% military discount for eligible personnel. There is also a deal to get an exhibit discount and free parking after 6PM with a restaurant receipt.