I added a test product to my store for zero dollars. I then set inventory to 1 and bought the item myself. When I loaded up my site again the add to cart button was there same as before. I clicked it and I was then told that the item was out of stock. Is there a way to gray out the add to cart button or some other way that the buyer can immediately see that the item isn't in stock rather than attempting to add it to the cart to then be disappointed.