D-BH109 AA Battery Holder for Pentax K-R KR K-30 K-50 backup DBH109 | eBay
Amazon.com : HQRP AA Battery Holder-Adapter Compatible with Pentax D-BH109 K-r K-30 K-50 K-500 Digital SLR Camera 39100 Replacement : Digital Camera Battery Grips : Electronics