Try searching for Ultralight props - that's what you're really after, anyway, I believe. A google seach turned up Arrowprops.com and TN-Prop.com. Both are manufacturers of Ultralight and experimental aircraft props and seem to offer what you are after.
Are you building a one person or two person Ultralight?
Seriously though, I've often wondered what someone would put one of those giant powerplants in.