- KSP Aria 'Wood Grain' Essential Oil Diffuser - Large (Dark Brown)$49.99Available online Available in storesKSP Aria 'Wood Grain' Essential Oil Diffuser - Large (Light Brown)$49.99Available online Available in storesKSP Aria Essential Oil Diffuser - Large (White)Regular Price $49.99 Special Price $29.99Available online Available in storesKSP Aria 'Wood Grain' Essential Oil Diffuser - Small (Light Brown)$39.99Available online Available in stores