Looking at getting this for a gift for a relative, while this isn't the cheapest its ever been it seems to be a decent deal at the moment.
Just tick the box to apply the coupon, the price is discounted during checkout.
Thanks to thedragon:
"Interestingly the discount is only applied to the first bottle added to the cart. Nothing stopping you for making more than order, if you’re buying multiple bottles, which seems a shame to not reduce packaging and shipping." :)