I don't why they did not put one in the X3. There's plenty of space in the side door pocket. My 2003 BMW M5 has a coin dispenser built into the side pocket that fits flush and can rotate outward. Holds like 10 of each, quarters, dimes, nickels. They dispense one at a time. Pretty handy and organized.
1979 Porsche Tobacco Metallic 911SC
1996 Porsche Guards Red 993 C4S
2003 BMW Ti Silver M5
2013 BMW X3 35i Carbon Black M-Sport