Price Change For My Book on Amazon

When my book, The Bible's Most Fascinating People, was only available for pre-order on Amazon, they were offering it for $16.47. Now that it is out and available from any bookstore, Amazon's supply on hand has shrunk (they've apparently been selling well, forcing them to order more of my books for their warehouse already!) they have raised the price to $18.96. That's still less than the list price of $24.95, but not as good a discount as it was.