garm let me know that he had contacted the Waterstones (Oxford branch), by phone, to find out if they were selling trade and deluxe editions at the Alan Lee book signing event, and was told trade only

I have contacted HarperCollins about this, and am very happy with the response

We’ve noted that there has been some over-enthusiastic ordering in certain quarters, so we’re currently working on redistribution of stock to ensure that all bookshop events will have copies of the deluxe edition alongside the hardback. These events are for the fans so the last thing we want is for them to go away disappointed.