Start with the license, then the price
Online cartridge deals follow state law. A licensed retailer in California cannot ship a vape cartridge to Texas. The PACT Act blocks USPS delivery of vaping products. So the first step is to confirm the seller holds a state cannabis license. Look for a license number on the menu page. Then check the delivery zone. Most legal delivery services cover a fixed radius, often 5 to 15 miles. Some cover the whole state. No license means no legal sale.
Compare price per milligram of THC
A 1 gram cartridge at $40 with 80% THC gives 800 mg THC. That is $0.05 per mg. A 0.5 gram cartridge at $25 with 70% THC gives 350 mg THC. That is $0.07 per mg. Use this math before you buy. Menu prices often hide taxes and fees. In Washington, the retail excise tax is 37%. In California, the excise tax is 15% plus local sales tax. Add delivery fees, which run $0 to $10.
Parameters to check
- Unit count and volume: 0.3 g, 0.5 g, or 1 g.
- THC mg and CBD mg per cartridge.
- Hardware type: 510 thread, pod, or disposable.
- Oil type: distillate, live resin, or rosin.
- Batch date and harvest date. Prefer batches under 6 months old.
- Lab test panel: pesticides, heavy metals, residual solvents, microbials, mycotoxins.
- COA with a QR code and a lab name.
- License number and state.
- Delivery minimum and fee.
Pitfalls
- No COA. Walk away.
- Price 50% below the local average. That is a flag.
- Interstate shipping claims. Illegal under federal law.
- Payment by Cash App or Venmo. Those apps do not protect cannabis purchases.
- Counterfeit brand packaging. Check the brand's official store locator.
- Vitamin E acetate. CDC linked it to EVALI in 2020. A legal lab test rules it out.
- Expired batch. THC degrades to CBN over time.
Deal sources that work
State-licensed delivery menus post daily deals. Weedmaps and Leafly list dispensary menus with price filters. Sign up for a dispensary text list for 10% to 20% off. Loyalty points cut the price on repeat buys. First-time patient or customer discounts run 10% to 30%. Senior and veteran discounts run 10% to 20%. Daily deals on specific brands rotate. Check the batch date before you pay.