I notice you're in the UK - have you looked in BeautyBase in Whiteleys (the big shopping centre in Bayswater)? They carry a lot of discontinued perfumes - I think their business model is to buy all the stock from bankrupted shops and to sell it all at a discount. I've found things there that haven't been made for years.
I wasn't able to find any online UK sellers, but there seem to be some shops in the US which still sell it and will import. Meanwhile, there's always eBay! And if you want a really good, faithful cannabis note without doing the *whistles innocently* obvious, Demeter do a fragrance called Cannabis Flower which is pretty good; it's certainly a better interpretation of weed than Fresh's Cannabis Santal.
Not, of course, that I have any idea at all what such a thing might smell like.