You might give McMaster-Carr a try...... they used to carry quite a
variety of expanded and perforated metal.
McMaster-Carr Supply Co
P.O.Box 94930
Cleveland Ohio 44101-4930
cle.sales at mcmaster.carr.com
Ph 330 - 995-5500
Fax 330 - 995-9600
Ted Harper
tcharpe at aol.com