Instructions:Get a dot.com domain for just 99cents (74p including ICANN fee) using promo code Holiday99.
From a friend on Twitter and also publicised on internal GoDaddy.com pages. Just used successfully myself, but only applied to the first dot.com domain in my basket. Not sure if this can be used towards renewals too, but worth a try.
I haven't been able to find out how long this offer will last for, though suspect it may be for only a few days.