How much marijuana can you buy from a Ca dispensary?

10 bucks a gram

That guy must be buying some dirt weed. In California weed is expensive since it is mostly high quality stuff, so the set price is $20 a gram. Some dealers will go to $15 a gram if you know them and it isn't too high end, but no one sells for $10 a gram.

In Canada, it's usually $10 for regular stuff. Some Kush, and other things go for $20 per gram. Something like Afghan or OG Kush will run $20, but things not as popular, or not as good such as Code Red will go for $10