Look into your local library system's booksales (the books they are removing from circulation and the donated books).
At the small systems I've lived in it always was cheap ($1/$2 a book usually).
Moved to an area with a large system (yes you can look at ones you don't live in but for convenience and my house filled with books I don't bother) and their sale is awesome. It lasts about 4 days (Thurs-Sun) once a year. They have fairly cheap books in that $1-2 range with specials for kids books on the kid's day, but on the last day, :D they have (was $5 now cheaper) $3 boxes of books.
These are the boxes they bring them in and are large, they estimate they can hold 100 kids books, but you can stack tight and high. Anything in the sale (kids books, audio books, graphic novels, reference books, romance, sci fi, craft & cook books, fiction, nonfiction <3333) just search and put it in the box. You have to bring a dolly or a kids wagon to haul them around, but goodness it's heaven.
My library does this thing every spring where you can buy as many books as you like for whatever donation you can afford. I once saw a lady walk out with 25 books and she only paid a penny
At the small systems I've lived in it always was cheap ($1/$2 a book usually).
Moved to an area with a large system (yes you can look at ones you don't live in but for convenience and my house filled with books I don't bother) and their sale is awesome. It lasts about 4 days (Thurs-Sun) once a year. They have fairly cheap books in that $1-2 range with specials for kids books on the kid's day, but on the last day, :D they have (was $5 now cheaper) $3 boxes of books.
These are the boxes they bring them in and are large, they estimate they can hold 100 kids books, but you can stack tight and high. Anything in the sale (kids books, audio books, graphic novels, reference books, romance, sci fi, craft & cook books, fiction, nonfiction <3333) just search and put it in the box. You have to bring a dolly or a kids wagon to haul them around, but goodness it's heaven.