One thing they did tell me is that they take books from https://www.ingramspark.com/, except that ingramspark charges to produce a print and e-book. I haven't had any experience with this service, but I am willing to look into the site, if independent bookstores are willing to use this service. However, I will have to try them for the next book, Rita vs the Duende. There are some restrictions with Amazon, but I can still use both sites to sell my books (I think. I haven't read the terms and conditions for ingram).
Stay productive and keep experimenting. #Resist