Love those books so, so much.
(Want proof? Here's my write-up of the first one.)
ETA: Looks like the first book is $3.99, but the rest of the books in the series are $1.99. Thanks to Daisy for pointing that out!
Also, Catherine Ryan Hyde's Funerals for Horses is free at the moment.
I haven't read it, but, you know: free.