We published information about free CES passes if you registered before Sept. 30th here: Free CES Exhibitor 2011 Pass.
Well if you missed out on that, you can still get a free pass using the $100 off coupon code INVT.
Request your Pass Directly at the CES Site
* You need to complete this before December 31st or price will go up again.
What do I need to do to get the free pass?