In addition to the fan linked to this deal, newegg is offering a range of deals on fans and heatsinks. There are over 30 products with rebates, many of which come out to $0 shipped after the rebate!
They are under: Computer Hardware> Fans & Heatsinks>Useful Links: Mail-in Rebates
I'm not in the market for building a computer, but there seem to be some good deals! Check it out! Don't forget to mail those rebates in!