Last month on DomainQuestions.com, someone asked if there were any coupon codes at GoDaddy for .CO domain name renewals. It took some time, but it appears that GoDaddy has activated a coupon code for domain owners to save 30% off the list price for .CO renewals.
I don’t know if or when this expires, nor do I know if there’s a limit on how many names can be renewed. Others have confirmed that this code works: gdz637cd
There is a lot of speculation that the .CO Registry will see a huge amount of dropped domain names when the first renewals begin sometime around July 19th. With good deals on renewals and transfers, I would imagine that there will be fewer dropping .CO domain names.
Personally, I believe there will be a very large number of dropping names, but I would bet that others will see many of these names and re-register them when they are able to do so. Mike Berkens recently discussed the .CO backorder reservation system in case you are interested in learning how these names can be re-purchased.