The best place I found to source perforated grill material for home brew external speaker enclosures (ie: EC-2) is a local car audio installation shop. Their junk bin always seems to have lots of old speaker grills they never use. Prices range from $0.00 to $1.00 for a handful. Mind you, those are Canadian dollars; probably cheaper in the U.S ;-) Regards Dave VE6DRW K2 S/N 2171