AMEX offer Save 15% Every time you visit Starbucks and App Reloads-YMMV

Get 15% of your in-store purchase back as statement credit each time you use your enrolled Card at Starbucks by 3/5/2018. Valid in-store at stand-alone Starbucks locations and for app reloads. Limit $5 in statement credits.
Effectively load $33.3 for $28.3
http://www.amexoffers.com/