Although Concordia Publishing House no longer offers this book there "book page" still offers information about the devotional. Also, I found they still offer two free downloads in this series (see links below).
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Continue to Concordia Publishing House

View free downloads (related products)

Remember Me Children's Message (Downloadable)​

Remember Me PowerPoint (Downloadable)

Note: you need an account to buy and download materials, even if the download is free.