I needed a pair of Lithium AA batteries. I saw them in stock at Walmart.com (available for pickup today), so instead, I dropped by the store to grab them.

I checked all of the battery displays, but couldn't find them. (I found Lithium AAA.) So I ordered them online.

The next day, I got an email: "pickup order delayed, don't go to the store yet." A few days later, same thing. A few days later, "our apologies, your order has been canceled".

I've had this issue 2 out of 5 times. Not great inventory control.