This code was obtained through the email subscription page, and as the trend went with December and November, it's valid this January month only.
Edit (27/1): Added birthday promo code JANBDAY.
There's now a better promo code to use, and this code has no minimum spend:
CNY583D6 - $5.80 off.
If you're placing a small order, you're essentially paying $0.20 for postage.