I'm also having trouble getting it from Waterstones. I went in on the day of publication so, I guess, a week and a half ago? And the guy behind the till said "oh it was only published today, come back in a few days" as I eyeballed piles of "preorder" books dotted around the shop. When I went back two days later a different guy (with much huffing and sighing?) told me they were sold out, nothing in the warehouse and not arriving anytime soon and I couldn't even order into the shop.
I tried again at a big Waterstones in another town this weekend, and they said the same - nothing on the shelves, nothing in the warehouse but they could see that there were two copies in the Waterstones branches in Trafalgar Square and Kensington High Street and that was it. She also couldn't order it in for me. I pointed out it had been Observer Book of the Week, Sunday Times bestseller etc but she had no answer for me why there were piles and piles of other books being promoted and she couldn't even order me this one into the store.
I know at this point I should just buy it from Amazon or another shop but I feel like I need to make a point here to indicate to the people on the shop floor that there's a problem here, if they can't even order in a Sunday Times bestseller.