Tips for building a home library for kids on a budget?

[Paradice]

My goal this year is to really expand our home library for my kids. They are avid readers, and I want to foster that love for books, but buying new ones constantly adds up quickly. We visit the library often, but there's something special about owning certain titles. I'm looking for smart ways to acquire a good variety of books without overspending. Any brilliant tips or places you all have found for building a solid collection of children's literature without a huge budget?