jeda essentials ultrasonic aroma diffuser for the vehicle, works very well 

bought this to try out in my truck. It had good reviews when i was checking it out, and the price wasn't bad.
JEDA ESSENTIALS Car Air Fresheners - Ultrasonic Oil Diffuser with 6 Pre-Filled Aroma Pods, USB Rechargeble Battery, Can Last Up-to 30 Days, Adjustable Scent Level, Auto ON/Off, Car Accessories …
I believe I paid like $28 on sale at the time on Amazon