Opinion: Why Vertical Grips are Overrated for Photographers
Amazon.com : Pentax D-BG5 Battery Grip for K3 Digital SLR Camera (Black) : Electronics
Pentax D-BG5 Battery Grip for K-3, Black at KEH Camera
Used Pentax D-BG4 Battery Grip | MPB
PENTAX KP Battery Grip D-BG7 - Ricoh
Amazon.com : Pentax D-BG6 Digital Camera Battery Grips (Black) : Electronics
PENTAX Battery Grip D-BG8 Black for Pentax K-3 III Flagship DSLR Dust-Proof and Weather Resistant Construction with Capacity to Hold Additional D-LI90 Battery (37048) : Electronics - Amazon.com
Pentax K-3 Mark III EU Kit with Hand Grip and Extra Battery - Photospecialist
Amazon.com : PENTAX Battery Grip D-BG8 Black for Pentax K-3 III Flagship DSLR Dust-Proof and Weather Resistant Construction with Capacity to Hold Additional D-LI90 Battery (37048) : Electronics