Here are three excellent choices of tea tree oil.  Drugstore.com is an incredible resource for all of your drugstore needs, fast shipping and discount prices.

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this Product is 50% right now. Price is $5.25 for 1fl Oz Bottle

Tea Tree Oil ~ 100% Pure Australian Oil

Tea Tree is a pure oil, culled from the leaves of a tree (Melaleuca alternifolia), native to Australia. Traditionally, it has been used as a topical agent for the skin. Our superior grade of Tea Tree Oil is a meticulously analyzed to ensure that it exceeds the oil quality standards decreed by the Australian government.

This is the most economical bottle at $11.99 for 2fl oz.

100% Pure Australian Oil

Tea Tree Oil is a pure oil, culled from the leaves of a tree (Melaleuca alternifolia), native to Australia. Traditionally, it has been used as a topical agent for the skin. The Australian standard requires that oil of Melaleuca alternifolia must be composed of less that 15% cineole and over 30% terpin-4-ol. Our superior grade of Tea Tree Oil is meticulously analyzed to ensure that it exceeds the level of oil quality standard decreed by the Australian government.

Our Tea Tree Oil is composed of less than 5% cineole and over 35% terpinen-4-ol which qualifies for “Pharmaceutical Grade”, as established by the Australian Tea Tree Oil Industry Association.

This product is $9.99 for .5 fl oz.

Desert Essence Organic Tea Tree Oil is an inherently antiseptic essential oil organically grown in Australia, free of herbicides, pesticides or chemicals.

Organically grown in accordance with the California Organic Foods Act of 1990.

Desert Essence