Actually, the book also looks like it is selling out.

I went the day of release to the B&N at The Grove in Los Angeles (upscale west-LA mall) and they had 3 copies shelved spine-out in the current events section.

But looking around the web yesterday and today, Amazon now lists it as “In stock January 28” and the B&N website is listing it with a 1-2 week delivery delay.

That suggests the book is actually flying off the shelves far beyond the expectations of even Amazon to order enough copies.