Coupons:
http://www.secret-coupons.com/departments/sports.htm
http://www.ultimatecoupons.com/coupons/
http://www.smartqpon.com/find_by_store.asp

Best Pricing searches:
Biking goodies:
http://www.bestwebbuys.com/bikes/
http://www.qbike.com/

Shimano/Campy/Fox/Manitou/Rockshox/etc.:
http://www.comparisonpricing.com/

for shopping comparison do not forget www.froogle.com. Darn good.