Campaign Details: Sweet Earth May 2020 “National Hamburger Day” coupon campaign will run from May 28, 2020 (3:00am PST) – May 29, 2020 (11:59pm PST) or while supplies last. To request a coupon, you must be 18 years or older & USA resident. Coupons for free product (up to a value of $5.99) are only available while supplies last OR only for the first 10,000 respondents. Campaign is limited to one (1) coupon per person/email address/household. Coupons will be mailed out via US Mail within ten (10) business days of the campaign end date May 29, 2020. Sweet Earth not responsible for lost, late, stolen, mangled or undeliverable mail. Offer void where prohibited.