I was in the market for a GelaSkin and happened across this deal. All I had to do was register (free) on Cnet.com. There is a link there that takes you to GelaSkins.com and automatically applies the 30% off. I just placed an order and it worked for me.
Hopefully you'll see the "ad" at the top of this link: CNET Marketplace | Find Today's Best Technology Deals - CNET