If you go to Ebay and type in 2007 World Jamboree, Be Prepared!
I've been to National Jamborees and NOACs and the patch sales, after those events are always hot for a few weeks.
After the WJ and what I'm seeing, (stuff I threw away), being sold for is higher than I have ever seen.
Our .16 cent silky patch sold for $7.55, a Sunrise necker for $155., our Troop Cookbook for $36., the participant patch for $200., and a complete set of 7 neckers is up to $1,258. with 2 days left!
I've got most of that stuff, but wouldn't sell it for anything. In a few months the prices will drop to almost nothing. However, if you are thinking about a free trip to Sweden in 2011, a nominal investment, good timing, and Ebay can make it happen!