Target carries them in their "as seen on TV" section (near housewares). I think it was also $14.99.

I bought one, read the instructions, and returned it. It comes with a gasket (you cut it to fit) that you place along the top of your car window on each side of the fan. You aren't supposed to drive with the fan attached to the window because it may obstruct your view. (But it is pretty small.)

I returned it cause I didn't want to have to keep putting it (and the gasket) on and off.

Please post and tell us how you like it!