Ebay offers Volcano Ultrasonic Diffuser with Eucalyptus Oil Kit for $7 (reg $22) with free shipping.

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Product Description:
Get instant ambiance when you add the White Volcano Oil Diffuser Plus Eucalyptus Essential Oil from Opalhouse™ to your office, living room or meditation space. In white for a crisp, tidy look, this essential oil diffuser promises to fill your space with your favorite soothing scents, and it comes complete with a .16-ounce bottle of eucalyptus oil to get you started. The small size makes it ideal for placement on your desk, shelf, side table and more, and the included oil is made from clean ingredients for a choice you can feel good about.
This is your house. Where you create spaces as bold as your spirit. Collect objects as inspired as your dreams. Find pieces that remind you of every place you’ve been. Discover stories to inspire everywhere you have yet to go. This is Opalhouse.

• Scent: Eucalyptus
• Dimensions (Overall): 4 Inches (H) x 4.5 Inches (W) x 4.5 Inches (D)
• Health Facts: BPA-Free
• Includes: Aromatherapy Oil
• Oil Diffuser Type: Ultrasonic Vibrated Humidification
• Features: Intermittent Setting, Ultrasonic Aroma Diffusion, Automatic Shut-Off, Multiple Mist Settings, Multiple Light Settings
• Power Source: USB
• Battery: No Battery Used
• Care & Cleaning: Spot or Wipe Clean