From slick deal
嘿嘿，直接copy过来的
If you are in a area that is served by Google Shopping Express the use PROMO
CODE: GMAIL25 to receive $25 discount on your first order.
Fine print:
While we may need to authorize your payment method for the total amount of
your order without the promotional credit, the promotional credit will be
reflected in the amount actually charged to your payment method. https://www.google.com/shopping/express
