I wish I could figure out how Jaggedfury made 1 under $80. I was prepared to spend $50.
I spent probably half that making the same setup Jagged made.
20oz Paintball tank (ebay) 18.00
Co2 glass diffuser (ebay) 6.00
Tubing (lowes) 3.00
Needle Valve (lowes) 8.00
total cost so far= 35.00
***However- I have been unable to use the needle valve to control the output of co2 correctly. It appears as though I may need to get a different more accurate valve- or jump ship and get a dual gauge regulator.
I already have a full working co2 setup on my big tank. I was just trying to save some money on my newly setup nano. If only it ever worked that way!