Zipfy Freestyle Mini Luge Snow Sled
You can find these through Amazon, or Google them. Prices range around $35 give or take a few bucks. If you click THIS to see Amazon's video of them in action... with everyone from pretty young kids to teens using them.
Kids will have lots of fun in the snow riding the uniquely designed Zipfy, a fast and exhilirating downhill sled. Rails on the bottom of the sled give the rider the ability to slalom down the hill while a distinctive lever provides stability and helps with turning. The feet-first design make it easy to stop and control speed. Designed for young sledding enthusiasts ages 5 and older, Zipfy measures 21 by 13 by 16 inches and is available in an array of bright colors.
Get this leash to use when dragging the sled up the hill for $10 on Amazon.