Don't fall for a website that charges you $thousands$ for something that is not allowed!
Chairs, arch set-ups, and Chuppahs, etc. are not allowed anywhere near the ocean of any Hawaii beaches. They are only allowed in the tree-line (a distance away from the water) or in park areas.
FYI: There is a spot at Waialae/Kahala which does have sand just fronting the beach park.