Marsha,I love them! Our vitamin/natural food store has a great selection. It really depends on what you want them for. If it is for calming wild chamomile is great. I recently bought a spray for joint health that also claims to be calming and soothing. It contains magnesium along with arnica extract and lavender oil. Let me tell you, I can spray it on my aching hip at night and I drop off to sleep and dreamland. Tea tree oil is great in soap and shampoo. I also make a concoction to steep on the stove and inhale to nip a sinus infection in the bud. It simply is done by adding a few drops each of clove oil, cinnamon oil, and thyme oil. I have never used a diffuser but they look cool.