Just listened today to a podcast interviewing an indie author. His book is distributed partially through a non-Amazon printer, and the price has been the same for its entire release. Even so, he has noticed that occasionally Amazon will revert to some seller with a ludicrous price, even though the book is still available for well under half of the new purchase price. Could be a shady reseller that you’re running into. Don’t know if this is what you’re running into, but it reminded me of it.