There are alot of good ones for $100.
Just a word of warning: DO NOT TOW YOUR CAR WITH A COVER ON IT. Regardless of the type or price of a cover, even a custom-made one, the flapping and/or vibration will ruin your paint.
I bought my car in Baltimore, had put 3 covers and 42,000 shock cords on it, and was leaving the next morning to tow her to Dallas. I got a panicked call that night from the RRTC president, warning me NOT to tow her with a cover, that the damage to the paint would be worse than any water damage that I might get. Water will dry, abrasion will not. He was ready to cite me a bunch of horror stories. So, I took the covers off, and the tow home was a piece of cake.
I must admit that, even with all the shock cords, I wouldn't have been 20 minutes on the interstate and I would have had canvas flapping and vibrating all over the place.
BTW, I was told that if you want to tow a car with a cover on it, first cover the entire car with soft bed sheets, then completely stretch-wrap the entire car.
Anyway, for what it's worth, I wanted to pass this along to you. If a whole bunch of folks disagree, so be it.