[Product Question] What's the best/most reliable tea tree oil on Amazon for under ~$10?

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I have read that some of the oils are not what they are claimed to be, that there are additives or they are diluted, etc. I just want to make sure I'm getting real tea tree oil and nothing funny. I have used Desert Essence in the past, but I just wanted to know my other options.What are your suggestions? Prime eligible is much preferred.
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Submitted by ShineeBep