To qualify for the promotional discount customer must purchase 3 packages of dry herb vaporizer cartridges. Offer valid from 7/19/18 â€“ 7/26/18. Strains available: Sour Diesel, Holy Grail, and F48, Banana Kush and Taffie. Products availability may vary per location. While supplies last. Offer cannot be combined with any other offers or discounts.