Many of my author clients have noticed that books uploaded via IngramSpark are priced much higher on Amazon than either Booktopia or The Nile. All take the same feed from IngramSpark and all three are hyper-modern business focused on efficient fulfillment, so one would expect very similar algorithmically driven pricing.
Let’s try a few specific examples:
John Dunlop’s excellent book The Wandering Pilgrim (ISBN 9781922958969) :
Booktopia: $43.90 plus shipping
The Nile: $38.96 plus shipping
Amazon Australia: $59.84 plus shipping
Or Garry Moore’s well-researched colonial history, Ridley Willians (ISBN: 9781764082846)
Booktopia: $38.75 plus shipping
Amazon Australia: $72.01 plus shipping
Balkarri Surfcats. Entertaining children’s illustrated fiction. (ISBN: 9781922958723)
The Nile: $20.32
Booktopia: $25.35
Amazon: $36.35
and finally, Tales of An Ancient Marathoner, the life of a long-distance runner (ISBN 9781763860179)
Amazon Australia: $38.12
The Nile: $38.12
Booktopia: $42.95
Some discussion of the possible reasons behind the often massive discrepancies may be found here.