Have you thought about trying Craigslist? Here is what I found on my local CL for a very fair price. I only keep up to 3 bantams in it, but it suits my needs. My husband and I are not crafty so we let other build for us. My other suggestion is to find someone local that can build one for you, their are lot's of folks out there with the skills and patience and the price is generally fair. Just my thoughts.
