Method What is the cheapest nitrogen setup that will 100% work that I can buy in germany?

[HopefulSleep]

I did some research and found out that em got used before but it got shut down.
If I got it right then I need a 5l nitrogen cylinder, a 15lpm pressure regulator and a mask that is air tight or did I miss anything?
The cheapest 5.0 5l nitrogen cylinder I found costs 230€, but I still need the pressure regulator and mask.
I don't even know which regulator would fit and which mask is the cheapest that will work and @GasMonkey is offline since last weekend and he seems to know the most about this method from his posts.
Can someone help me with this or direct me to someone who knows about this method and is still active?

 

[GasMonkey]

Mask setups require a demand valve to be able to meet the demands of inhalation.
The way to go is SCBA gear + air-to-nitrogen adapter to be able to connect it to a Nitrogen cylinder.

 

[Das Nichts]

I did some research and found out that em got used before but it got shut down.
If I got it right then I need a 5l nitrogen cylinder, a 15lpm pressure regulator and a mask that is air tight or did I miss anything?
The cheapest 5.0 5l nitrogen cylinder I found costs 230€, but I still need the pressure regulator and mask.
I don't even know which regulator would fit and which mask is the cheapest that will work and @GasMonkey is offline since last weekend and he seems to know the most about this method from his posts.
Can someone help me with this or direct me to someone who knows about this method and is still active?

Read the last 20 pages of the inert gas megathread, especially posts by myself and @Wunderkind they contain all the info you need for scba nitrogen.

I got my stuff for ~ 260 € (without the gas)