Taken from the Costco "Summer of Savings" listings:
Week of 8-4-2008 to 8-10-2008
BOGO FREE Sony DVD+R/DVD-R Item #277669,277653
277669 should be the -Rs and 277653 should be the +Rs.
I'm not sure if these will be regular DVDs or printables.
It seems that Costco is now going with Sony, and will no longer carry TDK. To me, that's a definite improvement.
And on a related note, Costco currently has an unadvertised price of $15 for their remaining 100-pack TDK media.