This article is from the Food Preserving FAQ, by Eric Decker firstname.lastname@example.org with numerous contributions by others.
Zlotka : Berlin Packaging has a great catalog of containers for all
manner of things. 1-800-4-BERLIN will get you a free catalog. Good
customer service, too. lost the attribution here, sorry.. You might
try Glashaus. They have some big jar sizes, the largest rings I have
from them are 4.25" at the outside. They are at Glashaus Inc./ Crystal
Lake,IL (815) 356-8440.