the cheaper the essential oil, the less quality it has. Alot of your essential oils are "fake", or chemically created fragrant oils that have no theraputic qualities whatsoever. For example, there are many different types of Lavender that can be made into an essential oil. But its the particular species called Lavendula angustofolia that has the most potent, and CORRECT therapeutic properties for relaxtions, to help sleeping, headaches, is antibacterial, helps with burns etc etc.
If you're looking for a company that sells good quality, 100% pure essential oils, go to this website:
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I dont think you can order the products online but you can probably contact them and they will send you and order form and they will send it to you wherver you are in the world. I used to work for the company so I can deinfately vouch for the oils they use, as I have all forty of them.
If you have any queries, please just ask me and I'll do the best I can to help you with any essential oil information you might need.