The owner is pretty active on this website. When he runs specials, he will post them. If you can't find one on their vendor page, then they are not currently running any specials.
I don't know about a promo code, but I called and they were more than willing to work with me on things. Wonderful service, but I was told they may ne raising prices soon. Chances are after a price increase they would still beat my LHBS.