Just gotta vent

So I just have to say that I hate Walmart! You are basically forced to shop there because there is no where else to get what you need at a somewhat reasonable price. I've been trying to be good and stay within my budget but EVERY time I go there I buy the sale items which are clearly marked and then when I go to pay it comes up a different price.
So I tell them the price is not right and they of course say, well that's what is says. No, I bought this item because it was this price otherwise I would have got the brand I love for the same price! Walmart is notorious for this and most people don't even notice they are being overcharged. And the only reason I am able to keep track of it is because I have the worst luck and always get the slowest lady possible. The one who stops to look at every item you buy and even say, Hmm. I'm not going to stop and take pictures and write down every little item and price and who wants to go back and check it all again when your kids are crying because you've been waiting to pay for 30 minutes. I've gone back a few times and shown them where it clearly states the price and then I have to stand in line again for another 20 minutes for them to correct it. It's a huge pain so ya just end up paying whatever they decide at the register. Why do they even put up prices in the first place? In many states, if the item is marked wrong they have to give it to you for the price it says, even if it's their mistake. Some stores even give you the item free. But Walmart of course says, so, we'll just pay the fine. One lady actually said to me, "It's only a few dollars." Well, those few dollars on every item just added up to be $100 so if it's only a few dollars then Walmart can do without instead of me.