Nembutal is generally obtained in liquid form, but is difficult to obtain from any place in the US, Canada, Europe or Australia. In the Peaceful Pill Handbook1, Nitschke and Stewart have a long section about how to obtain this drug, mainly centred around purchasing it in person from vets in Mexico, Peru, Bolivia and Thailand (although noting that taking it out of any of those countries is illegal, as is posting it back to your home country). Prices are much cheaper than mail order.