Not sure if this helps, but maybe a year back when we were looking for a table for the formal dining, we were looking at glass tables. Anyway, one of the stores was telling us about their custom work because there was one table we liked but wanted the glass sandblasted, they said they knew where they could get it done. You could try asking one of those stores if they know a place.
Another option might be to contact whoever sold you the chandelier or the manufacturer and see if they'll sell you replacements