Microcenter has the Intel Core 2 Quad Processor Q9300 (Boxed) for $99.99 (In-store Pickup Only). Select your store on the right hand side of the product picture.
Next lowest prices
$138 - eBay
$222.64 - Buy.com
$226.99 - ApexSuppliers @ Amazon
$229.99 + S&H - Newegg
Other places - from Google Shopping
Benchmarks
Anandtech - a part of a bigger review
Anandtech Forums - Q6600 or Q9300
Some guys posted more links in the original thread found on SD.
Next lowest prices
$138 - eBay
$222.64 - Buy.com
$226.99 - ApexSuppliers @ Amazon
$229.99 + S&H - Newegg
Other places - from Google Shopping
Benchmarks
Anandtech - a part of a bigger review
Anandtech Forums - Q6600 or Q9300
Some guys posted more links in the original thread found on SD.