I don't know of anywhere in europe, but it might be an idea to email these: http://www.vibroworld.com/parts/tech17.html
I'm sure it can't cost much to send a power switch from the US. They should at least be able to tell you what type of switch you need anyways, which would be a start...
Also, double check to see if they do have the switch, that it will work with our voltage over here. I saw some switched rated at 125V, may not matter internally but it's worth asking the question....