Weed Delivery in London - How High 420 is a cannabis dispensary in London, Woodstock, and Brantford. Plus, you can order recreational and medical marijuana from our online weed dispensary. How High 420 has got your back in London, Ontario. We are a proud London dispensary, admired for our top-notch marijuana and fast weed delivery in London, Ontario. We have a wide range of cannabis products available for pro smokers as well as novice cannabis users.