There are a couple of items called channel wire. A "U" shape one and a flat strip. I suspect you don't want the straight strip type.Take a look at this google search for "channel wire" sterling http://www.google.com/search?....terling
and see if any of them have what you want.
If by "bunches" you mean 25 to 50 ounces you might find one of the suppliers able to special order it for you from one of the few remaining GF manufacturers.
Let us know if any of the links points to what you want. I can do some more inquiring if needed.