I bought this one:

• http://www.amazon.com/gp/product/B00DD6LCQY/

6 months ago and it's been working fine ever since.

$8.35 on amazon, and free (not prime) shipping.

Look's like there's lot's of people selling them, pick the seller you trust the most:

• http://www.amazon.com/gp/offer-listing/B00DD6LCQY/ref=olp_tab_new?condition=new