Yes I have one (made by ShelterLogic) right now for extra parking capacity. They work well against rain/snow/bird poo but are quite ugly. As long as you use the corner point augers and get them into the ground a foot or so the things are pretty stable. No need for a concrete base or anything.
If you have one of them nazi HOAs you probably won't get away with it; if you don't and actually live somewhere where you don't have other people telling you what you can put on your own property, not an issue. YMMV. Mine cost about $200 and I got it fully erected in about 3 hours. I'll probably pick up a second for the boat until I can expand my garage...
Ahh, the joys of too many ambitious projects...