Just a heads up , I bought some buttons from the mentioned ebayer (28 red buttons). The are not the same as what you would get from Happs. At least not the ones I got. The are much flatter and dont have the same style of raised bevel around he button. The dip in the center of the button is not the same or as deep as Happs and you can really feel the difference. Also they feel very cheap, very light. And the microswitches are the loudest I have ever heard.
I am not trying to bash the seller , I got what I ordered very quickly with no problems but it was not what I was expecting and ended up ordering 28 red buttons from Happs anyways.