Take a look here for a jumping off point.
http://online.wsj.com/article/SB1000...683424564.html
I've seen a few of the top nordic skiers around here use them, and I've considered one myself
EDIT: Here's the one they use
http://www.skiwax.ca/extra/extra.php
Last edited by Youngin; 11-25-12 at 01:03 PM.