Talking electrical frequencies, there is a cheaper alternative than what you 
mentioned in the Enar device, or, more for practitioners because it has the 
readout, the Scenar device.  I bought one here in Australia from Enlightened 
therapies, and Invet also make one, in Russia or the Ukraine, plus the UK and 
US have sources, I think.  Our exchange rate is such that it might be worth 
checking the price of getting one from here.
www.enlightenedtherapies.com
http://www.invet.net/40/e/test_e.shtml
http://www.scenartherapies.com/

"The SPACE HEALER is a light weight, highly manoeuvrable, hand-held SCENAR 
device. The ENAR SPACE HEALER is a personal device, which works from a 9 volt 
battery through a smart computer chip via a delivery head that stimulates the 
Neuro-physiology in a interactive and self intelligent way. Both the Amplitude 
and Frequency can also be adjusted to suit the problems being treated. This 
interactive 'dialogue' with the Neuro-physiology seems to accelerate the 
natural healing processes initiated by the central nervous system. This allows 
the body to 'heal itself' rapidly, often producing fast relief of pain, whilst 
also promoting the restoration of optimal health."

An Aussie University - Macquarie, I think - has been trialling it with neck 
pain and found it effective.  The report is out now.

I find it all part and parcel of the homeopathic - biochemic - frequency 
medicine thing.
Rowena