D I Y
The only way you can guarantee the quality of the oil is if you know the quality of the cannabis it was made from and the best way to do that is undoubtedly to grow your own.
A pound (400 grams) of cannabis can be produced in a 4′ x 4′ (1m x 1m) space in under 4 months.
Dispensaries & Compassion Clubs
The cannabis oil available from USA Dispensaries varies in quality and purity with prices ranging between $20 to $80 a gram, some private American oil makers are advertising 60 gram courses of oil for between $2,500 to $8,500
Growing your own cannabis is the ideal solution, however purchasing enough bud to make 60 grams of oil can be expensive, some licensed oil makers in America are fortunate enough to have access to a pound of legal cannabis bud for $2,000 and their oils are very good value.
In other countries and jurisdictions the cost of pound of cannabis bud is artificially high due to prohibition, the stricter the anti-cannabis laws the higher the cost!