I bought a cheap one size "small" from my local K-Mart for AUS$50. It fits nicely. It's not entirely waterproof, and I keep it in the garage. The only problem is that it's designed for left hand drive vehicles, as it has a door access zipper on the passenger side. You being in the US, this wouldn't be a problem for you

Any cover is better than no cover. If you expect a lot of rain, get a second cheap waterproof one to put over the top.

You can get more waterporoof ones for AU$80 or $90 but a $50 one and a $20 one does just as good, and the cheap one can be sacrificial, you can let the Sun damage that one. And get another cheap one in 12 months time.

The biggest killer of car covers is the Sun. I had an expensive one on my original datto and after 18 months it was shredded due to Sun damage.

Chris.