Godaddy codes seem to be slowly dwindling but there are still plenty out there. I had a bunch of renewal, transfers, and even a few hand registrations I needed to take care of today. Here are the codes I used today (January 9th, 2014) and they all worked for me. Those outside of the US may have different luck. I used a credit card for all.
$2.49 ($2.67 after fees) MARCUS249
$2.95 Dot Com Transfer ROCK295
$8.99 Renewal bb50kd5
$2.95 New Reg. Used this for another BACON295
30% of Renewals: Used for dot tv renewal but works on anything I believe BIGWIN30
$4.95 for 3 Names, $7.99 for any more you hand register (If you run out of Hand Reg Codes) MMANUTS1
$9.99 Dot Net renewal bbx50d5
Let me know if they work for you or if you have one better.