Do you have a non-grease type or oil-free type for the AR regulator?

Yes, the non-grease type regulator can be selected with the part number AR∗∗-X2400. 
Please refer to the Specialized Products for General User (P.G. Information) of SMC Website. 
Also, the oil-free type of the regulator can be selected from SRH series.
AR-X2400
SRH