This is my choice at the moment, a plastic copy of a pingle
It's all plastic construction, fully sealed and has the option for normally open or normally closed switching
It has a fairly stiff spring, so it doesn't fall out but i think that the plastic curly lanyard bit is rubbish
It is less directional so will also pull out if you go over the bars
so I would replace it with one of those Disc lock curly things that have a wire in them
As for where you could get them in the USA. I'm not really sure
Last one I bought cost me about $40.00 AU
And yes, If you come to Lake Gairdiner, and get me in motorcycle scrutineering, I will ask you to demonstrate to me that it stops the bike
G