Amazon.com : Glorich K-AC128 D-AC128 K-AC109 K-AC168 D-DC128 Replacement AC Power Adapter Kit for Pentax K30 K50 K70 K-r K2 K-S1 and K-S2 Digital SLR Cameras,D-Li109 Replacement(but not Compatible with Pentax KP) :
Power Ac Adapter For Pentax Optio M50 M60 V20 W60 W80 L50 Ricoh R50 Olympus Fe-370 Sanyo Xacti Vpc-e10 Digital Cameras - Ac/dc Adapters - AliExpress
Amazon.com: HQRP AC Adapter Compatible with Pentax K-AC132 38780 K-1, K-3, K-3II, K-5II, K-5IIs Digital SLR Camera Power Supply Cord + Euro Plug Adapter : Electronics
Power supply replaces Pentax K-AC50, D-AC50 for Camera, 2 m | 800107465
AC Power Adapter and DC Coupler for Pentax K-AC109, K Series SLR Digital Camera | eBay