I saw this on the Bay Canada (item # 390087639748):
as a battery powered ultrasonic cleaner for $1.49 + $6 shipping from Hong Kong.
Described as follows:
Product Description
Brand new ultrasonic cleaner!
ON / OFF switch, easy to use
With suction base to avoid slipping when vibrating
Great for both professional cleaning and personal use
Suitable for cleaning:
Electronics component, mechanical part, pen-head, printer-head, watch part, coin, badge, machine nozzle, small silverware;
Glasses, sunglasses, contact lens accessories, optical lenses;
Jewelry, waterproof watch, ring, necklace, earrings, diamond, bracelet and gemstone;
Denture, comb, toothbrush, electric shaver head, razor, and dining appliance;
Tattoo guns and tubes, and piercing tool;
CD, nipple, fruit, anything you can image to clean!!!
Power: 2 X AA battery
Vibrates up to 6500 times / minute
Product size: 7.5 cm in height, 9 cm in width
Container size: 4 cm in height, 8 cm in width
Is this actually usable for watches? For <$10...that's cheap.