If you want to stay comfortable in the backcountry, we highly suggest decking yourself out with Patagonia clothing. Not only will it keep your dry and cozy, but it will last forever. If it doesn't then they have one of the best lifetime guarantee anywhere! They also donate 1% of all proceeds to a grassroots organization. It is worth EVERY penny.
Sierra Trading Post offers a variety of outdoor clothing and gear at discounts from 35-70% off retail prices. Yeah, it might be last years stuff, but you still might find the clothing your need for a trip to Alaska or your next ski vacation for less.
Outdoor gear and clothing from big brands to the small and undiscovered. Find everything you need for your next adventure at Backcountry.
REI offers a little of everything you will need for a trip to Alaska. You don't have to be a member to shop there. Also, they offer REI-Outlet.com for discounts on discontinued and overstock gear.
National Geographic Online Store offers great maps and mapping software. If you would like to order a map of where you will be traveling, this would be a great place to look. Choose a TI map of Prince William Sound East for Valdez departures, Prince William Sound West for Whales, Ice and Islands trip, and Wrangell St. Elias for those trips. Look under National Park maps.
Get a "Trails Illustrated" map.