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
For Sale - Sold Pentax k-1 and battery grip - PentaxForums.com
Rumors: Pentax K-1 pre-orders will be shipped with a free battery grip - Pentax & Ricoh Rumors