You can get footpads anywhere including Parazapper and eBay.
This package is double the cost of the F165 from AR for nothing special, the amplifier is NOT required and useless for anything above 20khz.
If you wait for JAB he has a link to premium pads but if you want to not polish then get the SS ones from UZ: http://zap.intergate.ca/footpads.htm
BTW: Metal Supermarket or some shop will cut those up from scraps for a few bucks...construction boom is over...