Grab 12 months of pure online joy for only $34.50 (save $15) over at Buy.com ($49.99 list).  Free shipping is currently offered as well...

Even if your membership is not due for a while, you can still purchase the card now, and stack the time to your Xbox LIVE account.  It will just add 12 months to the existing time left on your account...

Check it out:  Buy.com - Xbox LIVE 12 Month Subscription Card