Leeks aren't an ingredient I use much at all myself, probably because I don't see them in my rural grocery store. When I shop bigger stores or farmers markets where leeks might be available, I'll keep an eye out. Particularly in autumn because leeks pair so well with many fall-inspired recipes.
Fun fact I think many people have started to learn over the years: the cans of pumpkin puree on grocery store shelves are from "processing pumpkins" or "canning pumpkins," while the pumpkins we decorate with and carve are "ornamental pumpkins."
Fun fact number two: Illinois is a top state for processing of edible pumpkins. Curious about how pumpkin farming impacts Illinois? Check out this article from the Illinois Farm Bureau.