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
PENTAX KP + D-BG7 Battery Grip - PENTAXever.com
Pentax KP with Battery Grip D-BG7 - PentaxForums.com