I have 13 chickens and need a portable and cheap but efficient coop, right now the three hens are staying at my grandparents farm and my chicks are here in the house at my house, but I would like to be able to keep them all here at home, and I can't think of a coop, but I don't want them to free range because there are to many predators any ideas would be helpful. 
Again,
Portable
Cheap and efficient
13 chickens
Any help will be handy.

Again,
Portable
Cheap and efficient
13 chickens
Any help will be handy.