If your interested in
booking (it's not in stock) a E6600 it's available here for a reasonable $349.
http://www.shopblt.com/cgi-bin/shop/shop.cgi?ACTION=thispage&thispage=011003000509_BK12401P.shtml&ORDER_ID=!ORDERID!
They predict availability on August 16th.
If anyone is out for an E6700, PCSuperStore saids they are in stock and selling for $581. (They also have Extreme Editions)
http://www.pcsuperstore.com/search.php?keyword=intel+core+2+duo&x=0&y=0
And a good deal for the E6400 and E6300 are here:
http://www.ewiz.com/query.php?dp=2&categry=0&s=Intel%20Core%202%20Duo%20Processor&Go_Search!_x=23&Go_Search!_y=17&dt=&ob=&nl=10&anchor=
E6300 for $204 and the E6400 for $265. The E6400 Retail includes free shipping and there are also OEMs available for cheaper.
The other option is TigerDirect, but they mostly have OEMs.
Availability should improve by next week since Intel targetted August 7th to be the date to begin general availability of all models since the Extreme Editions launch first.