Hello Redlady,
 
There are several ways to do this.
 
1.  You could talk to your child's teacher.  Ask her what materials she recommends you use with your child.  She may have some extra materials that are similar to the ones she's using in the classroom.
 
2.  You could go to the school office and ask to look at specific catalogues that contain teacher materials.  Your child's teacher could recommend some specific publishers.
 
3.  You could look at the bottom of the worksheet pages for the publisher name, and then you could look at their catalogue on the Internet.
 
4.  You could go to a teacher's store in your city and look through the worksheet books they have.  You'll likely find some that are similar to the ones your child uses in the classroom.  You could ask your child's teacher for the names of teacher's stores that are nearby.
 
5.  Sometimes grocery stores and drug stores have a children's section and you'll find workbooks there.
 
If you want to use these over the summer, perhaps you could talk to your child's teacher, and she could recommend the best ones and how many pages to work on each day.
 
Sincerely,
 
Sylvia HS
Reading Specialist
Author