Err.....you do know that you can get nitrous much more easily and effectively by simply buying the cannisters at a head shop, right? Just ask for a box of "whipits." They're legal, because they're just what you use to make whipped cream the old-fashioned way (of course that doesn't explain selling them at a head shop, but....). I think last time I got some it was about 24 for $12 or so. Of course you also need a
cracker and some balloons into which to dispense the nitrous.
I don't really consider it worth it unless you're already doing something else like acid or ecstasy, though. But combine nitrous with one or both of the above and you can have an amazing experience....just make sure you're sitting down first.