Covid-19 vaccines, vaccine passports and faked negative test papers are being sold on the darknet.
Prices range between $500 (£360) and $750 for doses of AstraZeneca, Sputnik, Sinopharm or Johnson & Johnson jabs.
Fake vaccination certificates are also being sold by anonymous traders for as little as $150.
Researchers say they have seen a "sharp increase" in vaccine-related darknet adverts, while the BBC has been unable to verify if the vaccines are real.
