That's way too much! I just bought eight 230w Solarworld panels at $0.69 a watt but the reality is they're going to do an inferior job on the install and wiring also. On a 12v system you should have some seriously thick wire being used or your voltage drops will make the system all but pointless. You should have a good charge controller a battery monitor and so on. For the money they want build yourself a good proper system or spend the $150 shipped for the 100w Renogy kit and do it yourself, either way you'll have a far better system than what they're offering.
Also, don't expect a ton from 100w, with a PWM charge controller you're going to get 80w top, even with 5 hours of full sun a day that's only 400 watts of power a day. You should never drain your battery past 50% so that would be enough to keep a healthy one battery system topped off or extend your boondocking but you will have to know the limitations.
I have 1,380 watts on my roof and still have to be reasonable with use.