It's been awhile since I've seen one.

Yeah they do. I was amazed when my daughter came home with one as a birthday thank you bag a month or two ago.

i could not understand the instructions.

my grandfather used to buy those for us. He flew remote control airplanes, and we would throw those around while he flew his RC planes at the park. He had a big collection of them, one with a sling shot, others with wind up rubber band propellors.

Hell yes. You can certainly get them in most seaside towns in the UK.