You will find no better customer service than REI. You will find better prices, but keep in mind that REI members get 10% off all regularly priced items, and more if they use an REI Visa card.

Try Amazon.com. They often have good prices along with "free super saving shipping". But caveat emptor, as their prices may not always be the best and free shipping only applies to select items.

Beyond that, the internet is your oyster.