Amazon not only has biofeedback, neurofeedback, QEEG, and neurology books but it also hosts biofeedback equipment, gauss meters, anti-static mats and other items that are often used by biofeedback professionals. The Amazon tab is found to the right of the top menu: 

• Neurofeedback/biofeedback books
• Biofeedback devices such as Freeze Framer, Resperate
• Computer software (Windows 7 needed to remove Vista), etc.
• Gauss meters
• Anti-static mats
• Headphones
• Health & fitness items (suppliments, exercise, vitamins)