I got mine online at Premier1 as they were recommended in one of the books I read. I just googled them. They have different heights, spacing for posts. You can buy extra posts to keep the fence from sagging or for corner posts. I got the semi-permanent one since my main coop is stationary but the others are just a bit lighter weight. Prices vary for what type you want and lengths. The temporary electric poultry fence comes in 164', 50' and 25' lengths, if I remember correctly, and it's supposed to be a bit easier to move. The semi-permanent comes in 100' and 50', as I recall. They also sell the chargers: solar, AC or DC. Order the kits for fencing and charger and you will have everything you need to set it up and turn it on. You do not have to run the fence in a complete circle. You can start and stop wherever, say off the corner of your coop and you will still have a charge on the fence. I'm sorry I don't know how much $ per square feet. I really like mine and feel like it was worth every penny.