In reply to tompg7:
You can get all kinds of fancy expedition sleds made from kevlar and whatnot, made by Acapulka or similar companies, but for many uses the orange plastic Paris Expedition Sled is fine. They're only about $50 from certain US hardware stores, but are hard to get as they are expensive to ship.
If you Google 'paris expedition sled' you'll find plenty of pics and also companies charging lots of money to add poles, grommets, covers etc. Depending just what you need, much of this is unnecessary. Basic Paris exped sleds have gone to both Poles. The smaller lighter Paris model beneath the Expedition is the main one used by Denali climbers. The Expedition model is significantly bigger and stronger and a different shape.
These might also be OK:
http://www.snowsled.com/ice-blue-plastic-pulks/Post edited at 11:16