I can't find it anymore, but here's the one we got for my goats. It's already gone up since we got it. We didn't put a floor under it because it's for the goaties, and we got leftover shingles from a local roofer.
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The chicken's shed I can't find. It didn't have a floor, either, but we just got 2 sheets of OSB and some 2x4s. It is like this, but at HD and much cheaper.
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I found this one, though. No floor, but comes with a roof, and nicely illustrates the idea that you can find bigger, better, and cheaper.
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I built my first coop out of recycled fence boards and t111 siding I got off Craigslist for $10 a sheet. It was 4x8 with a wood floor and a metal roof. I spent $250. The majority of that cost was the roof because I special-ordered the color.
And don't forget about hoop coops! Super inexpensive and easy to build.