When I inquired about the reason for the cancellation, I received this response:
"Currently, we do not have a timeline on when we will have this product available again. Factors that go into determining product availability include the manufacturer/vendor, product design team, and shipping.
If you are still interested in this item and would like to receive a notification for when the run launches again, please click on the "Request" button on the product page. This will set you up to automatically receive an email notification when the run is active again."
Disappointing. With the ship times as long as they are already, I don't think I can confidently buy Christmas gifts on Drop unless they are in stock. I'm fairly new to Drop, and don't want to pull the plug because of one bad experience, but reading the discussions I'm cautious now.