Usaci fees vary with the points that particular event is listed as. I would have to ask about the show on Sunday, as I'm not 100% sure since I didn't set up that show this year. As for the classes. With any org you pay for each class you would like to run in. In most orgs (depending on the class and setup of the org) you will get two spl runs to attempt and achieve your best score. For SQ it varies with each org but most will do some type of "in car listening" style testing and a spl run in most cases. Again it will depend on the org and class you decide to compete in.
I will be at the show on the 30th and I'm normally not to far from the USACi area, but I may also be in the main building hanging around the white FJ with a wall. So just be sure to introduce yourself to me if you get the chance before you pay to run in a class and I will help make sure you get into the right class.