It is a whirly tube, corrugaphone, lasso d'amore or bloogle resonator.
To be honest, I was not expecting my search for "whirly music tube" to come straight back like that :o)
If you Google "buy whirly tube" you'll get a fair few hits. I'm not going to link them as I have no idea how good any of the sites are.
In my opinion, "Bloogle Resonator" should be the preferred term. By law. Because how can you not love it?
Is there any trick to playing them, or will they emit the same sound
no matter how you swing them?
According to Wikipedia:
The faster the toy is swung the higher the pitch of the note it produces.
...which makes sense. However:
It produces discrete notes in the harmonic series like a valveless brass instrument. To be played in concert as a lasso d'amore the length of the toy must be trimmed to tune it.
So presumably if you want notes from different harmonic series (I don't know enough theory to know what that actually means) you'd need a set of different sizes.
The other tubes that are not being whirled are obviously stiffer, and could just be PVC tubing cut to length; however they are likely to be boomwhackers.
Which are basically PVC tubing cut to length :) but pre-tuned, colourful and commonly available from loads of places.