A while back I was doing some searching around on the interwebs for solar pv panels and came across a seller that sells them on Ebay for about $1/watt. The seller goes by the name fred480v.
Here’s an auction for two 160 watt panels for $330.
http://www.ebay.com/itm/2-160-Watt-12-Volt-Battery-Charger-Solar-Panel-Off-Grid-RV-Boat-320-watt-total-/271885508220?hash=item3f4da39e7c:g:AtcAAOSwv0tVdJAX
Here are auctions of other solar pv panels he sells.
http://www.ebay.com/sch/fred480v/m.html?item=271885508220&hash=item3f4da39e7c%3Ag%3AAtcAAOSwv0tVdJAX&rt=nc&_trksid=p2047675.l2562
He sells stuff for boats and RVs, too!
Thanks