problem of connection cost

effectively perform stove. By cons it is sold for propane and gas, but the connection pin on the stove is fixed.
I bought this for a propane stove connection.
The pipes are sold for either screw connection or by pin. No hose is mixed (one side connected to the pin, the other screwed onto the bottle Propane)
but to have a pin Propane Butane must purchase the regulator because no pin is sold with the Propane regulator
flexible connection of cost 19 euros + 21 euros regulator propane = 40 euros
more butane regulator for the pin 23 euros more
cost of connecting 63 euros - very expensive for a device that costs about 50 euros.
I would not have taken this stove if I had been in power before.

Information taken: we do not find the connecting pin Propane because the product does not conform to current standards