Well it depends a lot on the dealer...
On average glass is a lot more expensive than regular old crank, but it's surprising how many people sell fucking crank and call it glass...
Generally some good glass will go for 70-90 bucks a gram (as opposed to 40-50 for crank), but it will keep you up for days, I believe it's like 130-140 a teener, not too sure, it's very dependent on the person you're buying from...
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Lying on the stained wretched sheets with a bleeding virgin, we could plan a murder or start a religion...