I've seen new panels for sale out here in ca on craigslist for as low as 0.60 a watt. In most cases you need to buy a pallet to get that deal, which is usually 20-26 panels.
Be sure to pay attention to the panels efficiency, if its not listed theres a site which has a huge database for this. The name escapes me at the moment.
When it comes time for me to buy some I'll probably find someone to go in on a pallet with me.
http://www.skoolie.net/forums/showthread.php?t=9883 - 7.3L 4x4 Shuttle Bus Toyhauler conversion