The Bureau of Labor Statistics produces the PPI which is a good source of commodity price trends. Link is to page that allows you to select lumber, or whatever and then you can select a table and graph of lumber prices.
http://data.bls.gov/cgi-bin/surveymost?wp
Another informative post, Thanks
It's important to note that from where I sit South Walton County has an abherrant micro-economy. A good example can be shown by builders having materials delivered, even common lumber, from companies outside the geographic area. We buy Cypress through Mobile, AL and I've seen Regal Stephens taking lumber deliveries from Alabama as well.