If you like the look of wood grain but want to switch out your scents more often than 300ml use, the InnoGear Wood Grain 200ml diffuser is a good option at around $25. It also has four timers, seven colors that can rotate or be steady, and the wood grain look. The mist can either be high or low, so you can choose the amount of scent diffused in your room. It’s also very quiet. One of the biggest benefits of this unit is that the lights come out in a few bands, not the entire unit. That way if you want just some light at night, this is the best essential oil diffuser for sleep.