I have bought from both Tamraz and Part's place and while the people are not your best friends when you walk in the door, they are a business that sell many many parts. I believe it's a very common practice in this industry to get the sale, and ship when the back ordered part arrives. I am not saying that is right, but that is common place.

Tamraz has thousands of listings, so maybe it just slipped thru the cracks? I have picked up the parts from them, and they are a relatively small shop. Good people though. That's my two cents.