You could try Amazon.
Simply put [+Helicopters +Children] into the search bar and see what comes up.
Here's a couple that I found.
cl12pv2s
http://www.amazon.com/exec/obidos/tg...glance&s=books
http://www.amazon.com/exec/obidos/tg...glance&s=books
The link to the search
http://www.amazon.com/exec/obidos/se...677774-3638451