On Wed, 14 Jun 2006 14:09:48 -0500, Chris W wrote:

Does anyone know where I can get a reasonably priced ($30 or less)
switch that can handle at least 200 amps at 13.8V?

IGBT transistor rated at 200amps - $30
http://www.mpja.com/productview.asp?product=15539+QT