I got a 10X10 Ez-UP at Walmart for $97 and change. Works really well and can be erected without help once you get the hang of it. The size provides coverage for my Corvette, but a single side curtain would help. I think I can add a side curtain with a sheet of material and a few snaps.
I've got an EZ-Up like FlyNavy's except I bought mine at Sam's. It came with with 3 side curtains, a pair of casters to help with the setup, which I don't use and a carrying bag. Pretty easy to put up by yourself and alot easier to take down.