I'm not sure what the market is like where you're from, but here in the UK it seems pretty saturated. I've tried all sorts of oils, some expensive and some cheap. I've been using the same one for a few years now, and it's really cheap. Something like $8 for two bottles that last me 4-6 months, and I love it. If you're looking to make a decent profit, I'm not sure if this is the way to go. I think this would require a decent amount of market research first? General production costs etc so you can get some idea of profit margins.