Search for "Unionville Hobby" on the website www.GreatHobbies.com
There doesn't seem to be a website to order directly from Unionville Hobby, but you can find lots of information on their kits on greathobbies, plus vendor information with phone number and address. Unionville has several Beaver kits (they seem to specialize in de Havilland planes).
DeHavilland Beaver - 6'.40-.46
DeHavilland Beaver - 8' Radial
Dehavilland Beaver - 8' Turbo
Beaver - 12' 1/4 Scale 1.2-1.5
I especially like the longer nose of the Turbo beaver.
they also sell floats.