Tractor Supply is where I bought my grow out pens. These are great for babies, but not for full size hens. I paid $90 for this one (coupon for store opening). The extension on the right was $75.
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Again, this was great for the tiny babies. Once they got bigger, I had to buy a bigger one -
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The larger was $350 I think. They have held up pretty well. They are relatively easy to clean. The larger one MIGHT work for 4 or 5 chickens. But the smaller one isn't good for anything but small babies.
Were they worth the money? Yes, because I didn't have the patience to build them myself.