20" Tires 275/55/20

Does anyone know where I can purchase a set of Bridgestone Duelers 275/55/20 for a good price.  They are running around 170 each. 

I haven't shopped for new yet.
8000 mile set for $300 on e-bay...
http://cgi.ebay.com/ebaymotors/2007-TAHOE-SUBURBAN-YUKON-ESCALADE-20-BRIDGESTONE_W0QQitemZ170094203083QQcategoryZ66478QQrdZ1QQcmdZViewItem