9V battery holder with switch & 5.5mm/2.1mm plug : ID 67 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
HALJIA 10Pcs 9V Battery Holder Project Box with 2.1mm x 5.5mm DC Plug and On/Off Switch Case Cover Compatible with CCTV, DIY, Arduinos, motors, solenoids, LED strips: Amazon.co.uk: Electronics & Photo
Battery Box - Gotoh, BB-04W, Dual, for 9 volt batteries | Amplified Parts
Mobile Box Small - 9V or 2AA Battery Configuration Archives - Box Enclosures:
36S9VB Plastic Handheld Enclosures with 9 volt compartment
4 pieces, 145*87*25mm diy plastic handheld box 9V battery holder enclosure electronics project box hot sales szomk plastic case