If you just google 'domains' or whatever, you'll get a link to godaddy 6.99 domains. When you click through that link the code for a 6.99 coupon is already in your cart.
Same thing with SSL certs. If you google, 'SSL", "verisign" or anything like that, you get the turbo for about half off and it works for multiple years, not just the first. But as far as I know, you have to buy them all up front. I'm not sure about the other levels, but I know the turbo level SSL gets a price cut this way.
Not sure about the other products either. Its just something I found out while working there.