Tom,
This is where I go when I need to find something to use as grill cloth. This place has thousands of samples in books.
http://www.manhattantextiles.com/ Manhattan Textiles has a store on North Ave. across from Mayfair shopping center. Take a sample of your old grill cloth along with you so you can find something that might be suitable.
You will not find anything with metalic threads. I have searched everywhere. Many years ago there was a place in NY that had bolts of metalic fabrics, but none of that stuff was usable because it was too glitzy.