I don't use the more expensive essential oils for the burner, I keep those for skincare and massage.
I love the citrus oils for using in burners and they are not expensive - such as lemon, bergamot, lime (with basil), orange with rosemary and frankincense.
I usually buy my oils online and in larger quantities and I look out for special offers and so build up my collection.
It's always good fun to experiment take the tops off the oils and hold up to three under the nose and you can get an idea if they work.
Love Binah
xx