Hot Tub Dealers in Denver, CO The following dealers are located here. You can also find a Dealer by Zip Code. International Hot Tub Co. Inc.4275 Broadway, Ste ASee more International Hot Tub Co. Inc.1035 Zuni St.See more International Hot Tub Co. Inc. – 4275 Broadway, Ste AInternational Hot Tub Co. Inc. – 1035 Zuni St.