It ain’t free, but if you’re low on cereal and your only alternative is pumpkin spice everything else in the grocery store, Dollar Tree has 5.5 oz Cap’n Crunch original and 4.4 oz Crunch Berries.  Use the $2/3 coupon from 8/21 rp and it’s roughly equivalent to paying 66¢ for standard size box.  Coupon scans fine; dates are 2017.