Does Shades of Green have a Class 6 store or do I need to bring my own booze?
They do have a small "px".
I seem to remember they had some, but don't expect a great deal of variety. It depends on how much you'll want and how picky you are.
Yes, they do sell liquor in the store run by the Exchange. It seems like I remember a nice selection.
We find it a bit pricy. Cheaper to buy elsewhere.
They have an decent selection of common brands. Hands-down the cheapest liquor on property, although if you want to hunt around in town you might be able to find it a bit cheaper. Personally, maybe saving a few bucks isn't worth the gas, time, and effort for a case of beer or a bottle of rum or whiskey...