I get calls for largemouth bass from time to time which I no longer produce.
Jeff Blankenship of A & J Fisheries in Vandalia, IL should be able to help you out with some largemouth bass and has some large specimens in one of his production ponds.
Jeff is a licensed fish farm. Just remember some states can't buy largemouth bass legally other than for stocking purposes such as Mississippi, Alabama, and South Carolina. Texas requires a special permit for "protected fin fish" of which largemouth bass are one.