Well Here are some Godaddy discount codes. These codes always save me some money every time I try to register or renew domain name.
DOWNFORCE - This code is one of most famous codes which give you a 10% off. Works most of the time unless they temporary suspend the code.
35% - gdz515xb ($7.98 com renewals including ICANN)
30% - fbf30tld (New regs only)
28% - gdz523a
27% - gdz428by
25% - gdbbc1026
20% - gdbbc15 (60$ or more)
15% - gdbba1550 (50$ or more)
24/06/2011 -
6.18$ .com registrations. Make sure your cart is empty and copy and page this link to your address bar,
If it doesn't work then try replace the code at end of the url with one of these,godaddy.com/domains/search.aspx?isc=gofnl114a
gofn4004aa
gofn4007aa
gofn3007aa
gofnl114a
gofn025aa
gofnl101a
Some of these codes might be expire after a while. Also you can use combine these codes.