Searching through the Pentax Singapore webstore, extended warranty is nowhere to be seen.
Extended Warranty Statement
1. The extended limited warranty is registered with PENTAX Imaging Company. It is not refundable or transferable and is only valid if received at the same time as the purchase of a new PENTAX Camera, which is covered by a PENTAX New Product One-Year Limited Warranty.
This extended warranty applies only to the PENTAX Cameras distributed solely by the U.S. distributor, PENTAX Imaging Company, 633 17th Street, Suite 2600 Denver, Colorado 80202 and purchased from a PENTAX authorized dealer.
http://www.pentaximaging.com/support/#!warranty-information
I would personally buy it here in the US, the few hundred you save from buying from Singapore will surely be the same in terms of "what you're getting", as in with 20 dollars more from the K-30 here, you'll get 2 year extended warranty which can save those hundreds in the long run. It will also be more time consuming if you have to send in your K-30 you bought from Singapore to Singapore to get it repaired.