Buzzard Billys does have a wide range of sandwiches including a line of Poboy sandwiches for lunch. It is kind of a small chain with restaurants in Waco, TX, Des Moines, IA, Lincoln, NE and La Crosse. Here is the web site.
Another recommendation if you want to stop at a good ol’ fashion drive in is Rudy’s. Their car hops use roller skates. If you want to sit inside they have some booths as well.
Fayze’s Restaurant and Bakery in downtown La Crosse is another place we have had both a breakfast and a lunch. I especially liked their breakfast.