This is at least of 4 pounds of nitrous oxide. This material is 99.9% pure and is marketed for making whipped cream.
This is a crazy cheap price of only $10 a pound!
I have two containers of nitrous here of unknown quantity. What I do know, is that one container weighs just over 4 pounds more than the other. As such, even if one is completely empty, there is at least 4 pounds still present. There might be even more, but I do not know the empty weight of these cylinders is.
This product is marketed for making whipped cream, and there are many other legitimate uses for nitrous oxide as well. However, if you even suggest that you might use it for anything that is illegal, I will not sell it to you.
Price is $40 (cash only), pick up here in northwest Napa.