I received a card in the mail today from Saks that is called "Mystery Money". The card states to bring it in between the 13th-16th and has a value of between $20-$1000. When you make a purchase you are told at the time what the worth of your card is. It appears to be valid at Saks Fifth Ave. & OFF 5TH as well. I do not see anywhere that states there is a minimum purchase required. Has anyone else received this yet?