MARK WILSON COURSE has a basic Super X Styled suspension that has been a standard of magic for at least 60 years now, it is one of the great stand-by props that you can make, provided you work with someone that understands how to properly bend & weld the metal. You can find other such systems in the TARBELL COURSE as well.
Depending on how large a person you wish to float as well as your typical performance situation, you might want to opt for the smaller "Flying Carpet" styled suspension (don't laugh, the Penndragon's used one for years); Go to Abbott's and get a Super X or find the plans for the Gwyn Suspension... all of these are great for the typical "living room"/small stage engagement.
The Chair & Board is neat but don't go on the cheap; they can and do collapse in one of several ways which can lead to an ugly legal mess with you holding the purse strings, should someone end up injured (and even trained assistants get hurt on these things, so keep that in mind.)
There are some others out there, you just need to look around. I know that Abbott's and Grant/Klam Magic produced several nice props of this sort for years.