As of this moment i havent see any gambling sites or casinos that do offer 0% HE.Most of them do really have it yet gambling sites are businesses and no one would really
operates for free on all the expenses that they spent on maintaining the site and their staffs.They do make profits or money with HE thats why its impossible for you to seek it on.
I've seen some of them offer out 0% on a short duration for the sake of promotion but that wont last long.