HF 20% Coupon schedule. Probably.

Here's where the HF 20%-off coupon lives today:
http://www.harborfreight.com/20off-coupon912-aff-17547.html

Evidently, HF posts a new coupon around one week after the previous coupon
expires. You'll note the current coupon expires 3/31/13. The previous
resident of this web page expired 2/28/13.