My godaddy discounts list:

rad7 : 30% off domains
gda348s : 30% off domains
pf25 : 25% off order of $75 or more
podfinder8 : 20% Off Orders over 35 dollars
podfinder7: 10% off anything

Godaddy hosting promo codes:
chn20 : 20% Off Hosting (1,2,3 yr accounts)
rush1 : 10% Off Monthly hosting accounts

Based on order size:
rush2 : $5 off if $30 or more
mopoff : $10 off order of $40 or more
gda3315 : $15 off order of $50 or more
rad5 : 10% Off order
podfinder8 : 20% off order of $60 or more
pf25 : 25% Off Orders over 65 dollars

Unique
buckssl : $12.99 SSL ( 56% Off )
auction12 : 50% Off auction accounts

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