New Book "business card"

Just got these book "business cards" in the mail from Vistaprint. I am participating in the Thirsty Generation conference Leaders' workshop next weekend in Loveland, CO, October 18-19 and they are promoting my book. Since it is only available on Kindle, I came up with these cards as a means of promotion. Workshop participants take a card and can scan the QR code to go right to the book's page on Amazon.