If you're not a stickler for purity and can settle for, say, 78% then you have no need of buying this ampule. Take a bottle, empty its contents and put a label on it. You have the element nitrogen within! If you'd like your sample a little purer then this is a great offering. Trapped within is nearly 100% pure nitrogen gas. Benign as it is ubiquitous, nitrogen is colorless (and tasteless) but when you apply a sufficiently high voltage it'll light up in a gorgeous purple hue.

Note additional options for this element on the Ampules section

CAS 7727-37-9