Kinko's will print a 18"x24" on standard stock for $12.00, then you get it laminated for $3.00.
A stake will cost you less than a dollar - if you don't have any left from the elections!
$16.00 and your on your way with a quality rain proof sign.
Mine -
France: No war for Oil?
Saddam: Deal!
I also have a Footprint of the great American Chicken sign -
http://www.cafeshops.com/cp/store.aspx?s=peacechicken.