My Cousin And I Started An Illegal Business?

We are under 18 and discovered that Amazon has many of our smoking/drinking needs. We practically look like Gods showing up to parties with the stuff we bring. I was wondering how much we should sell the stuff for. I mean if its like a 10 dollar bong and we run the risk of being caught. And dont tell me not to do it, I already have an order for $190, so im not stopping.