I have posted on LDOnline for years and am well aware of the inappropriateness of advertising or the promotion of materials for sale.
At www.greatleaps.com go to passages. You will see a list of grade levels. At each grade level from 3 to 12 there will be an assortment of fluency passages from books I got from a public school library. With these you can help find a book your child can read OR you can determine at what level a child is comfortably reading.
The passages are meant to be read in two minutes or less.