Use a Sodastream cylinder to dispense/carbonate your kegs. This is the ideal unit for the low volume user, or someone who does not want to put a lot of capital into purchasing a larger CO2 Cylinder. 
Soda stream cylinder adapters are also great for small portable keg setups. 
The perfect addition for a home brew set up just in case you run out of CO2 in your main cylinder at the wrong time