Found this online:
Use the code Holiday49, for free shpping on orders over $49 dollars. I'm not sure about the details (and can't vouch if this is authentic), but it's probably for the MLK holiday, and not valid after Monday.
Oh, bummer! I was going to put in an order today! Sorry for posting before trying it, and thanks for trying it. There is a coupon that I used successfully a couple of weeks ago: 5% off the whole site. This one expires January 22 (according to retailmenot.com) and the code is "off5".