Once you get good sources and you learn about your materials, you'll understand that fragrance oils are not for fine perfumes or any other products that are left on the skin. They are for candles, room fragrances, soaps, and other wash-off products.
There's a vast difference between hand soaps and shower gels, and products that stay on your skin like lotions, oils, or perfumes. Fragrance oils are not suitable for any of the latter.
If you try to get away with it, you’ll pay for it dearly and you’ll never be able to retail them. So, don’t skimp on ingredients. Know what you are using and what their uses are suitable for. A reputable supplier will tell you.
Look for suppliers who specialise in fine fragrance/perfumery ingredients, and not candle fragrances.
If a rose oil or lavender oil costs a dollar or two, you can guarantee it’s a synthetic fragrance oil, and it’s never seen a flower in its life!