Sure, and there are some places that include tax in the listed price. Usually businesses that do this figure it out so the price after tax comes to a whole number. This goes against the common .99 marketing psychology, and is a red flag that they might be skimming.

However if the sale is online and the company has a presence in multiple states they have to charge based on the user, which they cant do until they know who the user is.

Edit: Just to be clear I wish they would put the final price. Here is a picture I found of Pat's King of Steaks in Philadelphia, they have price tax and total for each item.

https://media-cdn.tripadvisor.com/media/photo-s/03/2c/33/c2/...