Basically, Kifaru has continued the entire Mountainsmith sled lineincluding the all-around Armadillo ($375), the giant Expedition ($495), and "kid kits" for converting either to a child hauler ($110 to $160).
Alternatively, a British Columbia outfit called Brette Manufacturing makes several sleds similar to the Kifaru products. These feature a molded plastic hull with aluminum traces. Brette's basic gear-hauling sled is called the Buggaboo Buggy, which sells for $295 U.S. A child seat can be added for an additional $70. So that makes it pretty competitive with U.S.-built sleds.
Sleds make great sense in many situations. With a sled, one person can haul 100 pounds or more without too much trouble, carrying 30 to 40 pounds in a pack and dragging the rest along behind. Sleds are perfect for self-supported winter expeditions, such as climbing Denali or a long ski trek in the Rockies. In skilled hands they can be maneuvered nicely even when the hauler is wearing skis, and with snowshoes they're very easy to manage.
Check out the Kifaru and Buggaboo Buggy websites.