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Abstract Introduction and Aims There is little objective market data on the price or potency of legal and illegal cannabis products following recreational cannabis legalisation. Design and Methods In the 2 months post‐legalisation in Canada (November–December 2018), legal and illegal cannabis retailers were identified from government lists and online directories. The store location, price and Δ9‐tetrahydrocannabinol (THC) and cannabidiol levels of dried herb and cannabis cookies were collected from retailer websites or Weedmaps. Results We identified 185 legal retailers (22 online stores, 163 storefronts; 65 government‐run stores, 120 private stores) and 944 illegal retailers (791 delivery‐only services, 157 storefronts). Relative to legal dried herb, illegal dried herb was lower in price (1 g: 10.23vs. 11.08, ⅛ oz: 9.37/gvs. 10.88/g, ½ oz: 8.18/gvs. 8.85/g; P< 0.05 for all) and higher in potency (THC: 20.5% vs. 16.1 …