This is an awesome aircraft! I've been in all of the ones Hawkins & Powers has, grown up around them. They even sent one to the naval museum in Pensacola called "Old Blue" by H&P.
http://broadcast.illuminatedtech.com/display/story.cfm?bp=106&sid=8034
ebay has a few once and awhile. Just check it everyday, they go for $20 to $60. And there are even vac conversions in 72 and 48 scale.
If you want some nice pics, go here:
http://www.airliners.net/search/photo.search?airlinesearch=Hawkins%20%26%20Powers&distinct_entry=true
http://www.airliners.net/search/photo.search?airlinesearch=Hawkins%20and%20Powers&distinct_entry=true
Hopes this helps!
"Become aware of what is not obvious."--from "The Earth Scroll" section of The Book of Five Rings by Miyamoto Musashi