RE:RE:RE:Ellis Martin interview with Robert Rohlfing from DME.VI was just referring to what Robert said here 9:12 into it:
https://youtu.be/zZKRnTMXRAU?t=523
Balloon grade is worth $1100 i guess he said. the $3500 you are referring to is the super high purity grade that tech/medical companies want? Either way it's amazing to go from $275 to $1100 to $3500 potentially.