If you have a LOT of time to kill, you might be interested to learn that you can make your own Poor Man’s liquid hydrogen using dry ice.
If you lack access to Liquid Nitrogen, then you can’t break a frozen flower or make wind chimes from strips of lead sheet. You can’t make LEDs glow super-bright. You can’t even shatter a rubber band. But what if you could make your own “LN2″ from easily available materials?