BTW I took a look at the $40 compressor at Wally World you were referring to....pass on that one man theres no way to regulate the pressure the CFM and PSI ratings are all outta wack...each box I picked up of the same compressor had diffrent measurements....
By the time you added a moisture trap and regulator to it and bought the hardware for the airbrush hose hookup you could have a real compressor either the Entrylevel Testors....or the $87(or somewhere in that range) C&H with the tank