I'm planning to pay the tag price of the item I switched it off.
What makes you think it's right to switch price tags for a cheaper price?
It's okay. I'm planning to pay up the tag price which is 120$
Price tag switching deprives business owners of the money they would gain by selling goods at the originally marked price. If you can't afford something, then you don't get to buy it.
Who is saying I can't afford it? I am paying the price that is on the tag of the item.
I really don't understand what you are trying to say, while technically yes you are paying the tag price, you still are deceiving the store. They will find out once they check inventory and you might get in trouble. I think you would feel better if you saved up for the real price and paid it.