Free Toothpaste?

While I was dying of boredom at home, my mom went to buy some toothpaste (we ran out) at Publix. She saw them on a 10 for $10 sale that expires at July 27. So, she decided to buy eight of them (idk why eight instead of ten) and placed them on the check-out counter. The price was marked $2.29 per package instead of $1. Confused, my mom tried her best to explain the tag she saw (she isn't very good at her English even though we lived here for over 8 years :\ ). The clerk, astoundingly (sorry mom but it's the truth -. -'), understood her and followed my mom to see the tag herself. She saw that my mom's  was true so she changed the price to $1. In addition, she gave the eighth toothpaste for free. But that's not the end of my story yet. When my mom almost reached the house, she realized that today's date was the 29th not 27.