So far, the best "free" deals were in October and earlier this month. I haven't seen any free deals other than the PIN codes shutterfly was giving away a few days ago and the free codes snapfish was handing out in October.
For now, Snapfish has a code for 25% any item in their christmas catalog, including cards: MERRY2010. MERRY1117 gets you 20% off cards plus free shipping (may be a better deal). In addition there are some other codes out there that you might (no guarantees as I haven't tried it) be able to combine with the photocard deal: 2010MY365 gets you 365 free prints with a $10 purchase; MERRY1116 gets you a free 4x6 flip book with any purchase.
Kodak Gallery has a link for 30% off that's showing up on my facebook page, you have to click the link to get the discount, but you may be able to get it by going to the Kodak Gallery homepage.
Picaboo has a code for 20% off cards: NOV20. They are also offering a code for 40% off any christmas items. This may or may not include cards.
The last deal I found is also for snapfish. You can get 20 free cards from snapfish for 300 points.
HTH