Here is my GoDaddy coupon list:

UKTop10: 30% off domains
UKTop251 : 25% off order of $90 or more
UKTop9 : 20% Off Orders over $50 dollars
UKTop8 : 10% off anything

Godaddy hosting discounts:
CHN20 : 20% Off Hosting (1,2,3 yr accounts)
CHN1 : 10% Off Monthly hosting accounts

More based on order size:
BUCK2 : $5 off if $30 or more
MOPOFF : $10 off order of $40 or more

Unique
BUCKSSL : $12.99 SSL ( 56% Off )
AUCTION12 : 50% Off auction accounts

Have these written down, don't think they expire. Print these out.