We bought one - from Amazon! - and its a bit small for our 4 girls so we are building our own. It'll have some built in storage and easy access to the waterer and feeder.
I actually bought a coop and run via a facebook yardsale group for 100.00
The run is made of a steel carport frame and is wrapped in welded wire with chicken wire along the bottom. The coop seen here is about 2 1/2 feet off of the ground and since this picture, has been enclosed. In the spring, the coop will probably either be replaced with a 8x10 barn or will be expanded.