$80 · Echofone - extend your auditory perception

Echofone provides accurate perception of frequencies which are ordinarily well above your hearing range. High frequency sound is converted to ultrasound and transmitted to transducers, which contact your skin. The ultrasound travels through your skin to the inner ear, where it is perceived as high frequency audible sound. This produces the sensation of sound through neural induction without any mechanical stimulation of the eardrum. Retails for $450 CAD. I've used it a handful of times, its in good condition. Comes with: Transducers, unit and power supply.