Quoted from gdonovan:I think a bunch of old stock came in that had been sitting in a container ship and they clearenced it out.
I think you're right. Some foreign oil was sitting on a container ship for many months and it all came in at the wrong time, so Grainger had to get rid of it as fast as possible before inventory costs ate them alive.
Obviously, they oversold that inventory. They may have been cleaned out so fast that they didn't have the logistics to update their website and halt orders in a timely manner. Or, they were just lazy.
Edit: Wait, they still have this listed as in stock? That really smells. Who do they think they are, a Chinese real estate builder?