You need the Aisling Grimlock series by Amanda M. Lee. It is hysterical. Her family are all grim reapers - they transport souls to afterlife. There are 9 books in the series and it is completed. They are available on Kindle unlimited as well. My favorite series of all time.
The series includes several interactions per book with departed souls.
Here is the first one:
It shouldn't show up there twice as long as you're using an ISBN; Amazon will sell its POD version of the paperback to make its cut of the printing royalties. Other vendors may offer it through Amazon, too, sometimes undercutting the Amazon price by using the retailer discount on Ingram.
Just putting my book up as an example: https://www.amazon.com/Trellis-Novel-Jools-Cantor/dp/1735593605/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=
Paperback is $14.99 through Amazon, same price on Ingramspark but available to retailers at a discount. It shows up as available on Amazon at $14.99 (the price I set with Amazon) but also through other vendors through Amazon starting at $9.99 (possible because my retailer discount at IngramSpark is standard 55%). Hardcover is only available through IngramSpark's POD, but Amazon makes it available because it's a vendor, sometimes undercutting the MSRP by offering it at close to the retailer discount, which would be problematic if it ever sold. This is all probably automatic on each of these sites (based on the fact that it's happening to my book).