http://www.skepdic.com/scrying.htmlYou need not buy any expensive stuff, just a dark bowl filled with water will suffice. A television screen tuned to static can also be used to scry. Anything upon which you can focus the sight, and yet does not produce a definate image can be used. The scrying device acts as an aid to concentration.
Basic technique is to stare at the surface and clear the conscious mind, then let the images show themselves to you on the suface of the device (be that water, mirror, tv etc).