Geez
Go to a gas station and walk casually through the parking lot, looking around at people loitering against the wall or in cars. If you make eye contact then give a little upward nod and see if they reciprocate. You should encounter a basketball American or a neo-hippie who will ask you if you smoke, or who you can determine will not be entirely outraged when you ask them if they know where you can find some bud.
If nobody tries to probe you for a sale or you can't find anyone who looks like you can ask them where to find weed, then you are dressed too square and/or at the wrong gas station. Try also head shops, vape shops, and homeless people who are lucid/coherent.
Don't let the money walk: Nobody needs to take the money with them and then go somewhere else to get the shit and bring it back.
Try to be discreet without being too overt about trying to be discreet (a.k.a. "having chill").
It's reasonable to want to see the product first, but what this looks like is: They let you see their bag of weed that they have in the car and they hold up a bud and move it around a bit so you can see what there is to see about it.
Not: They let you handle it and put it under a microscope and send a pinch off to get GC/MS analyzed or whatever.
It's just weed, it's not that expensive -- if you can smell it from outside the car and it isn't crushed flat and dried all to shit, then just buy it and give it a shot. This really goes for most common drugs unless you're buing good cocaine, in which case you still shouldn't be a huge nerd about inspecting the drugs, but for different reasons.
If you want to try to find something else, then do the same thing, get someone to try to sell you some weed ("you smoke weed?" means "would you like to buy some weed?" when it's not someone you're already hanging out with), then just say you're good on weed and ask if they know where you can find whatever else you're looking for. It doesn't need to be a big deal, just be casual about it, don't be all loud when you're talking about drugs, and don't call them by their clinical names.
Good: "Nah I'm good on that for now, you know where I can find some cream though?"
Bad: "Hey what's going on homie? Oh, no thanks, I don't need to buy any more marihuana at this time. But I'm gonna ask you a question, dawg. Do you or the rest of your posse happen to know where me and my homeboys could purchase some methamphetamine today? I just gotta go back to my vehicle and detain, I mean retain, I mean retrieve the, uh, my cash, so just hang tight right here for me, okay?"
Even if they look down on whatever drug you're looking for, they aren't going to make a big deal out of it or be all judgmental or anything (if they do then they're just the erection that proves the rule).
You can buy drugs on the normienet without getting scammed. Now it's time for another Good Idea, Bad Idea:
Good: You go on Tinder/Grindr or whatever and look for profiles near you with emojis that indicate they may have what you're looking for, get in touch, have a chat, and arrange to meet. Consult this handy cheat sheet provided by the DEA:
https://www.dea.gov/sites/default/files/2021-12/Emoji%20Decoded.pdf (the snowflake is also often used for meth, as well as "blowing clouds" sometimes).
Bad: Some clown with no post history sends you a PM out of nowhere on reddit to tell you about his buddy on telegram who has drugs for sale that will be delivered to you as soon as you tender payment via cashapp or cryptocurrency, and you waste energy thinking about giving them the time of day.
When you are meeting someone you found online, the golden rule still applies. Don't let the money walk. The money never walks. If they try to get you to let the money walk, don't let the money walk. "Sorry bro, it's not like I don't trust you or anything, it's just how I always do things, I never let the money walk, even if it was my own grandma, it's nothing personal man." This means if they are still "on the way" and they want you to cashapp them in advance . . . don't let the money walk.