I once bought several elements at shop.lego.com. Even though one element was available according to the website, I later - after ordering - got a message saying that that element had been removed from my order because it was no longer in production and they had run out of stock.
Just at the beginning of this year I bought Santa's Workshop for the sales price. The set was on backorder and I hoped I'd get it soon. I had also ordered Detective's Office at the same time. Well, a while later I was informed that Santa's Workshop would not be delivered and that it'd been removed from my order. Too many people seemed to have bought it and only some were lucky enough to really get it for that price.
Have such things happened to you too?