Bread-Bakers v101.n048.12

Here's a question for this group.  I have been baking and freezing bread in 
the standard run of the mill ziplock style bags, both the 1 gallon and 2 
gallon sizes.

I'm wondering if anyone on this list has information on buying the poly 
style bags that grocery store bakeries and regular bakeries use to package 
their bread?

I know that KA carries some but was curious about other sources.

Dick Smith