I think we made all start out maybe being a bit blind on the ways CO2 is used. That leads us to miss some of the obvious sources that may work much better for us in our little spot on the map. There are folks doing planted tanks all around and we think about them but then there are SO, SO, many other ways CO2 is used. Bet there are home brew folks in most areas. If not, there's welding , greenhouses, paintball, and most any place has some little joint that sells soda!