Hey trick. What I am using now is
www.nowfoods.com. I buy it on ebay I think it is 9.99 for one ounce. It has a dropper. I buy garlic, or any capsule i can open, and I put the drops in those and down them, because it is really hot oil. It is 100% but mixed with virgin olive oil. You can buy oreganol but it is more expensive, and less effective. You can buy it at any local health food store, but you will pay 30 bucks.
When I first started, I took 1 drop three times a week for a few weeks. Now I just take 2 drops in a capsule once a week. If I feel something coming on or my joints are bad, like in the cold weather, I take it more often, Once you start you will know when you need it. I have to say this has been my saving grace cause I dont really think its just luck I have been well. I have also mixed it with olive oil as a joint rub, and if you like smelling like oregano, it helps immensely. It is no worse than smelling bengay all day, and it does not burn the skin.
There is a book called "the cure is in the cupboard" Amazon about 10 bucks. that is totally about the benefits of it. Sinus, cold, flu, infection, internal and external, digestive, skin, joint, it helps everything.
Let me know how it goes