Hi Kama! I'm currently using this one:

https://www.nowfoods.com/essential-oils/rosemary-oil-organic

However, they have a non-organic version too, which works just as well for me. Someone mentioned in an older comment though that there are even smaller bottles of essential oil; I'm not sure which brands have them.

In any case, if you don't want to order them online, many grocery stores stock essential oils in the organic cosmetics section. :)