At first, when I saw the subject line "Free Ground Beef - This Weekend Only," I figured it was the latest wave of bizarro spam. But no, it's a genuine offer from Interwebs grocery delivery service AmazonFresh.com.
When you enter code GROUNDBEEF at checkout, you'll get two packages of organic ground beef patties free. It's less exciting when you realize that a "package" is 2 patties, so you're getting four patties total, a mere drop in the holiday BBQ bucket.
Still, free is free, so if you were planning on having crates of food delivered conveniently to your door this weekend, you may as well throw some beef on it. (Note: They'll be closed on Memorial Day, so order early for your parties.)