Start with the number that actually matters
Cheap weed is easy to find. Cheap weed that gets you where you want to go, from a shop that tests its batches, takes more looking. I start with cost per milligram of THC, not cost per gram of flower. An eighth at $25 that tests at 15% THC holds roughly 525 mg of THC. A $40 eighth at 28% holds about 980 mg. The second jar costs more at the register and less per high. Run that math against every menu before you chase a coupon.
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The second thing I check is who is selling. In the US, legal cannabis runs through state-licensed retailers, and those licenses are public record. If a site will ship to a state where adult-use sales are not legal, or only takes payment through a cash app handle, that is not a discount. That is exposure with no recourse.
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Cost per milligram, fast
Take the gram weight, multiply by 1000, multiply by the THC percentage as a decimal, then divide by the price. A 3.5 g eighth at 20% THC is 3,500 mg of flower times 0.20, so 700 mg of THC. At $35, that is a nickel per milligram. Anything near or under that is a solid budget buy.
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Parameters to line up before checkout
- Out-the-door price. State and local cannabis taxes run from about 10% to 37% depending on where you are. A $40 eighth can land at $55.
- Delivery fees and minimums. Expect $5 to $15 per drop and order minimums that often sit between $50 and $100.
- Discount stacking. Most dispensaries let you use one code, not three. Read the fine print on first-order, veteran, senior, medical, and loyalty offers.
- Product form. Shake, smalls, and pre-ground trim are the cheapest flower on any menu and the quickest to dry out.
- Package date. Flower older than six months loses terpenes and moisture. A cheap old jar is not a deal.
- Bulk tiers. Ounce pricing usually beats four separate eighths by 20% to 35%.
- THC percentage versus price. Mid-potency flower at a low price often wins on cost per milligram, even when a higher-testing jar looks like the better label.
Pitfalls that quietly eat the savings
- No certificate of analysis or batch number. Ask for the COA. A brand that will not show one is hiding something.
- Impossible potency claims. Budget flower listed at 35% THC or higher is a red flag, not a steal.
- $10 vape carts. Unregulated THC vapes were tied to the 2019 EVALI outbreak, and cutting agents are the reason.
- Social media and DM sellers. No license, no testing, no lab report, and nobody to call when the product is wrong.
- Free shipping that requires a $75 minimum, or a membership fee that costs more than the discount it unlocks.
- Stacked promo codes that get voided at checkout, leaving you at full price after you have already committed to the order.
An order sequence that works
- Confirm your state allows adult-use or medical sales and that you meet the age or patient requirement.
- Pull two or three licensed menus instead of one. Pricing spreads are wide.
- Compare cost per milligram of THC and the taxed total, not the sticker.
- Check batch dates and request the COA before you commit.
- Buy a small amount first. Test the flower or cart, then go back for the ounce or the bulk tier.
Where the real savings live
The biggest levers are boring. A medical card can cut or remove taxes in some states. Loyalty programs and daily deal calendars beat one-time promo codes. Bulk tiers reward planning ahead. Delivery windows during off-peak hours sometimes carry their own markdowns. I also track a few brands rather than a few stores, because a brand's own drops tend to be cheaper than the same jar resold at a markup elsewhere.
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Set a cost-per-milligram ceiling before you shop and hold it. That single habit does more for your budget than any discount code, and it keeps you away from the listings that are cheap for reasons you would rather not find out about.