I ordered a lens from Adorama on Sunday. Monday evening I received a notice that it was on backorder. However, even now you can still order the lens on their site without receiving any notice it is not in stock.
B&H is my usual choice for purchasing photography equipment with Adorama being a close second choice. In this case it was only a free UV filter for the lens, saving me ~$25 or so, that made me go with Adorama. However, if I had known they didn't even have the lens in stock I would have just gone with B&H. Fortunately I am not in a rush and can wait it out if I need to, but it is still rather annoying they can't keep their site up to date with their stock.