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amazon-full111Amazon doesn’t like it when it sells out of things, but that’s what happened after 14,000 people signed up to take a tour of its giant fulfillment centers.

“This has been way more popular than we could have ever anticipated,” said Amazon’s CEO Jeff Bezos at the company’s shareholder meeting this morning in Seattle.

It was only a month ago that the company announced it was opening the doors on several of its warehouses. The tours, which take place twice a month, are at facilities in California, Indiana and Arizona.

Bezos said the tours are booked until March 2015, but he plans to rectify the situation shortly: “The team is working very hard right now on adding more tours, so we can increase supply to meet demand.”

That includes adding tours internationally, he added.

The company’s fulfillment centers are massive operations. Some span as much as one-million square feet and employ thousands of workers. It’s always hiring like mad, and added more than 20,000 full-time workers in its warehouses last year alone.

One thing that visitors may see more of in the coming months when they take the tour: Robots. Bezos disclosed today that by the end of the year it will now have 10,000 Kiva robots on its floors, up from more than 1,000 currently.

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