Howdy,
Run about 8 kegs for beers.
Best I found was kegking CO2 bottles for 2.kg @ $149+freight or there's local agents in each state for $199.
Only use gas for pouring and bulk prime each keg...get about 40+ kegs from 1 cylinder.
For smaller setups just use a carb cap about $20 each, same end fitting as a corny post mix keg, on 2lt pet soft drink bottles carb beer or whatever you like into 2lt bottles and your away...anywhere.
btw there's a hack for the Tapking plastic pet kegs over at AHB site for those that want to reuse the 3.5lt bottles.
bt1