Starbucks Mobile Coupon: Half-Off Any Macchiato! By David Kraeer - June 21, 2017 1910 All Posts May Contain Affiliate Links. Read Our Disclosure Policy Here! TweetPinShare3737 SharesStarbucks Coupon: Half Off Any Macchiato Go here and enter your cell phone number to receive a mobile Starbucks coupon for half off any Macchiato! Limit single-time use, one per person. This Starbucks coupon is only valid June 21st – 28th.