I got 12 of them. I had the $15 off coupon that had come in the mail, but I don't get their emails anymore because it was just overwhelming. The lady at the register next to me asked the clerk if the 20% off email coupon could be used by more than one person. The clerk told her yes, so I asked her if I could use it too since that would be a better deal than my $15 off. She told me "no." I was so shocked and so was the clerk helping me that she gave me 20% off anyway.
I guess it was awkward of me to ask a stranger to use their coupon, but I figured she would be "sure", since she had just confirmed that it could be used over and over. It was definitely awkward after she said no.