Here is Amazon's reply to my query why the Standard Shipping Option isn't available to the Philippines anymore.
Hello from Amazon.com.
We have recently changed the shipping options offered on our website for orders being shipped to some international destinations.
Because packages shipped there by non-trackable methods frequently did not arrive in a reasonable time-frame, we now offer only Expedited and Priority International Shipping to Philippines.
We realize that the available methods can be expensive and apologize for this inconvenience. However, we felt it was in the best interest of our international customers to ensure that the items they ordered reached them safely and on time.
Please know that Amazon cares about its international customers and is working on ways to improve your service and selection.
Thank you for shopping at Amazon.com.