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) :
AC109 - Ibanez AC109 - Audiofanzine
K-AC128 D-AC128 K-AC109 K-AC168 D-DC128 Power Adapter D-LI109 Dummy Battery for Pentax K30 K50 K70 K-r K2 K-S1 and K-S2 - AliExpress