Here is their website but I know that therer are a few dealers in the States:
http://www.deltaforce-hk.com/
Right now the pickings are slim unless you want to dump a boatload of money. The OS. 21 might be one to look at.
I've got the Super-Vee 27 (I expected to see a lot of confusion on that one!) and the supplied engine seems to be enough for that boat.
I like to change my sig once in a while and was looking for something new and ran across that one.