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Ok, ok, I know this is pedantic, but in Stranger Things fanfictions when Eddie is selling weed and they give absolutely outlandish prices, not just for the 80s but for today too, it makes me laugh and disengage with the narrative.
Below the cut is some information that will help you write about Eddie selling weed. I've been around stoner culture for over 20 years at this point so feel free to ask questions.
Eddie is NOT charging $25 for a joint in 1986. Eddie would not be charging more than a few dollars at most for a joint in 1986 since you could get an ounce for $100 or less back then. An ounce makes about 56 joints of about half gram size. Now blunts, on the other hand, would be a little more expensive as they contain more weed, and you could get about 28 blunts of about a gram each. There are 28.35g in an ounce but most stoners just say 28g to an ounce.
So, he'd charge $2-3 a joint, and $4-5 a blunt, depending on his own markup.
A joint is rolled in white rolling papers, kinda like the thin sheets of a bible or like those oil blotting papers for makeup. Job or Raw are popular brand options.
A blunt is rolled in brown cigarillo paper, sometimes mixed with tobacco but not always. Think Swisher Sweets or Dutch Masters or Zigzag...you can Google those if you need.
Weed, by itself, is usually sold by quarter or half or full ounces but can also be sold by the gram. Usually, it costs just a bit more to buy by the gram because it's more work for the dealer. So, Eddie would have to be somewhat good at math and doing math on the fly. He'd also have a scale to measure it out with.
Weed is sold in a variety of containers, but the most common is cheap sandwich baggies. The 100 for $1 ones. Usually twisted and tied with a knot. You can also find dealers who use shopping bags, jars, paper towels and more depending on what they have on hand. From what we see in the show, Eddie uses cheap sandwich bags.
Eddie also wouldn't be selling high quality weed. He's probably selling "mid" or mid-grade weed. He might on occasion sell dirt/ditch weed, which is lower quality usually with seeds and stems instead of just bud/flower. He would probably not have access to loud/high tier weed. However, Argyle would, being from California, which was at the time, and remains, a stoner's paradise.
Ok, I'm going to end this here but if you have any questions please ask! Accurate fanfiction scratches my ND brain.