Getting a quote is free (like most places) however if you get a quote at their website (www.usaa.com) you get a $50.00 reduction in your rate. It lets you play with your options and adjust coverages, then if you have questions you can always call and talk about it.
They offer deductions for multiple products, multiple drivers, and a number of other things. You really can't know how much it would cost unless you got a quote.
Some of the nice features:
They work with your military pay schedule
You can choose different payment options, from paying in full, to semi monthly, to monthly.
They are the experts when you deploy if you're military. They can reduce your coverage to the minimum allowed by law in your state if you're going to just store your vehicle while you are deployed
They will always always take care of you no matter where you live or travel, and that's true of all their services (Banking, Investments, Insurance, Advice)