Why do you think you need solar? What is it you are trying to accomplish. It is difficult to recommend solar without knowing what your needs are.
A Renogy 100 watt suitcase solar panel is about $279 retail.
BTW, $400 in relation to solar is peanuts. If you need cheap power and a way to recharge your batteries, a 700 watt 2 stroke generator from Harbor Freight with a coupon is about $79. I have one as a backup to my $6000 solar system to top off the battteries on the rare occasion the sun isn't out in Colorado.