you best bet on CO2 is to go and get a restaurant grade regulator, then get the tank from a gas place. That will give you 90 psi adn the regulator will only run 50 bucks and the tank is like 30. you can just exchange the tank after that. much more affordable than buying a tank

2002 Honda Passport. 3 inch Indy4x lift with 912 OME's. 265 75 BFG m/t's with a 3 inch body lift, safari rack, tube sliders, tube rear bumper, on-board air