8 AA + 8 AAA + 4 C + 4 D + 2 9V Panasonic Heavy Duty Battery Combo
Energy Density of 9V battery vs. AA batteries - Bald Engineer
ACDelco Alkaline 9-Volt Batteries (8-Pack) in the 9-Volt Batteries department at Lowes.com
Amazon.com: Tenergy AA AAA C D 9V Battery, NiMH Rechargeable Batteries Combo, 68 Pack, 24 Pack AA Cells, 24 Pack AAA Cells, 8 Pack C Cells, 8 Pack D Cells and 4
Amazon.com: Amazon Basics 108 Count Alkaline Battery Super Value Pack - 48 AA + 36 AAA + 8 C + 8 D + 8 9Volt : Health & Household