The Google Pixel (XL) is doing better than many anticipated. Even Verizon has said that Pixel devices are flying off the shelves. Google's huge marketing budget and the company's hard work in creating the best Google phone has really paid off. So much so that certain Pixel devices were out of stock for a while, including the Really Blue limited edition. Google Pixel The Really Blue edition only comes in 32GB, but all other configurations are in stock now at the Google Store except for the 128GB Pixel XL models. They have already run out since Google re-stocked them. Even Best Buy...
Source: http://www.gsmarena.com/google_pixel_devices_are_back_in_stock_on_the_google_play_store-news-22159.php