I believe the standard retail price is $39.95 boxed with a mounting bracket, screws and log sheets. Ambient and Weather-Your-Way has a special price ($25) for CoCoRaHS observers.
The Stratus 4", the no brand 4" and the NWS 4" are all manufactured by Productive Alternative.
Or you can go to the next option, the 8" standard rain gauge for $411.00 for the rain gauge, $126.00 for the base, $32.25 for the measuring stick.
Both compare favorably when measuring rain side by side.