You can order a box of books from this site. They will range from toddler to young adult books. Each box contains approximately 55 lbs (give or take). You can also order more age/grade specific books, but it costs a bit more.
Sweet Sounds of Kindergarten : Math- Addition Cups! Cups have holes in them so that the manipulative a drop through. The kids use white board markers to write the numbers.or Velcro cups so students can dump in bottom