Why did Walmart stop selling Panda sauce!?

It wasn't that long ago that Walmart was selling this amazing Panda Express sauce. I had an awesome recipe that I came up with just for that sauce, but for the past year I have been unable to locate a Walmart that still sells it! I checked online and the cheapest you can buy is on Amazon for $23!! What happened!? Maybe the Panda Express company thought they would make more money by making it hard to find and expensive, but they made it so I wouldn't be able to buy it, so how does losing cusomers help anything? If Walmart hadn't had it for that brief period of time I wouldn't have known it evn existed. How many other people aren't going to buy it because they don't even know it exists? I just want to know WHY Walmart stopped selling it!?