Using print on demand (POD) means you are at the mercy of a service and printers who are constantl raising their prices. The bestr way of checking the price of a book is to click the link given and you will see purchase price.
Sadly, re-editing a book just to alter the cover price can take 30 minutes IF the system is working correctlyt at the time. With 200 books that is a lot of time.
Apologies but the "internet age" is far from user friendly!
