Picking right domain registrar saves more.
Godaddy (if you're not scared of horror stories) have 6,99$ + 0,18$ icann fee .com .net ..... TRANSFERS with this coupon. You can move your domains there easily for a bargain.
http://www.webmasterinter.net/2010/0...com-transfers/
Or if you wish to pay slightly more to sleep well at night, go for Moniker:
http://www.webmasterinter.net/?s=moniker
Enjoy.