I always find http://www.ribblecycles.co.uk
to beat most prices on the internet. Very often they have -10% and -15% coupons on their website which just makes it even better. Shipping is cheap aswell.
This is who I buy from as well. Really great deals on kit and tires. I just got a bunch of winter gear, a skinsuit, veloflex carbons and extremes, gatorskins, kmc chains, bottles. The shipping is especially great as long as you spend over a certain amount (not sure what the actual amount is, but under $200US) they upgrade to expedited shipping. My orders arrive in less than a week generally.