You won't have to curtail buying books, even if your budget is limited.
Garage sales are wonderful sources of great children's books.
Pop your kids in the stroller and get there early to get the best selection. Locate the used bookstores in your community. Some stores have an exchange plan that gives you credit for books you turn in and allows you to spend it on the used books in their stock. Mark your calendar and bring your shopping list. Let grandparents and other relatives know that books are the preferred gifts and be prepared to offer suggestions of titles you want your children to have in their library.