Yes, they have close to an entire cabinet full of different pen cartridges. The straight grams of concentrate vary in price between 14-40 dollars so I would imagine about the same plus like 5 bucks for the actual cartridge itself.
Yes. Prices vary by strain/grower.
I do not know. I will ask the next tome I am in. I would guess they do but don't know for sure.
Yes. They I'm have everything.
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