FOR THE MONEY you are best off building your own. To get a good quality prebuilt you are going to spend a LOT of money. Most of the prefabs are not made well and will not last long in the elements, they way over estimate the bird capacity they will actually hold which will likely cause problems down the road. Since you are in Maine and they may have to be inside a lot in the winter you need to ensure that they have adequate space. Most info will tell you that you need 4 square feet of coop space per bird and 10 square feet of outdoor run per bird. That is a MINIMUM starting point, and I would recommend that you go bigger. Space considerations depend on climate, personalities of birds, whether they free range or not, are you going to have a rooster(s) or not. Predator proofing is really important and if you do it at the beginning it will save you heartbreak. Adequate ventilation is also really important, for air quality and to prevent frostbite. Do some searching for coops, look at a lot, make a list of must haves for you, and then find something that encompasses those things. Some people convert sheds into chicken coops, which can be pretty economical to do. My must haves were a large clean out door on the coop, and the ability to stand up inside the coop and the enclosed run, which makes everything so much easier.
