When I was searching for a good copy of The Wizard of Oz to read to my kids it was impossible to use Amazon. Since the book is out of copyright but still popular the results are for terribly formatted print on demand paper backs that don't include the illustrations. It's out of copyright, spend a little effort and do a good job!

I eventually found the series in hard cover from Books of Wonder. I buy from them or seek out used hard cover books for out of copyright books now. Abebooks is still useful though they are owned by Amazon so who knows for how long that will last.