Im not saying what im doing is right but you really dont need any machine.Nitrogen is heavier than air so if you put your nugs in some kind of container,lets say a 5 gallon bucket w/turkeybag liner and then slowly bleed nitrogen in it will displace/force the air out and leave you with nitrogen,you can then seal it up.There are machines that cost ALOT that can do this process more automatically/perfectally but IMO its not worth it.I just recently opened a couple jars that were over 1 year old,1 with nitrogen and a
boveda pack and one with no nitrogen,just air and a
boveda pack and i could not tell the difference in looks,taste or high.I always have large nitrogen bottles around so have played with it alot but never really seen much practical difference in the end,i think storage in a cool dark place is much more important,it might make a difference in much longer term storage but who keeps weed for multiple years?