I found these fun little bookmarks at Staples. They had a whole stack of them for a couple of dollars. In each box I write the chapters or page numbers that I want the kids to read. Then when they complete a box they mark it with an "X". I only do this for their extra reading. I want my kids to read for fun. They can turn in a completed bookmark for a dollar. The faster they finish the more money they can earn.
So far it's working. They boys picked out some really great books that they are enjoying!