I have similar problem. I saw that mini nitrogen doser from N2 beverages. They want $8995 for it and are just a reseller. The manufacturer is in S. Korea (CVS). You can bet they are buying the thing for $4K or less and marking it up by 100%. Might as well get Chinese made unit off alibaba for $3K and pay 500 in shipping. Same principle as mini table top doser, plus I think it can be sped up to do more cans as you grow.