I went to checkout and saw my shipping would be $12.99. After watching some review videos online I discovered your products appear to be high quality and there was a groupon advertised. I purchased the groupon and then discovered that my shipping price went up to $16.99. I was very disappointed. It's frighting that you would increasing your shipping costs for customers are using a promotional code in such a secret and sneaky way! Understandable if its an algorithm glitch, but if its intentional, you should at least let your customers know you will increase your shipping prices if they use a groupon.