Hexagonal trampolines are still quite rare in the trampoline market and this is probably due to the high costs.
One of the most popular brands of hexagon trampolines is Magic Circle.
Magic Circle have been manufacturing trampolines for over 25 years and they only make trampolines of the highest quality.
Hexagon trampolines typically come in sizes 12ft & 16ft and are specifically made for use in a backyard. The most popular hexagonal trampoline seems to be the Magic Circle Kidwise 12ft Trampoline with safety enclosure.