With the amount of things that they will not sell to minors, I swapped my acetylene and oxygen tanks today... basically bombs/ missiles. Just something I thought of on the way home, thought I would share.
Also, how much does it normally cost to fill up the 40 CF tanks? The oxygen was $23 and the acetylene was $27; last I knew the acetylene was about $75 and the oxygen was around $60. I have never went myself, so I am not exactly sure. When the guy told me it was $67 and change, I almost fell on the floor! That includes a box of striker flints and a torch wrench.