http://www.happcontrols.com/pushbuttons/954002xxxxz.htm
and lots of other stuff.. they also have an office in the uk.. postage ais reasonable.. looks really good
Check these buttons out!!
http://www.x-arcade.com/arcade_buttons.shtml
I have 40 for my next MIDIBox… They are very inexpensive, and of exceptional build quality… I love them!!