I needed a button to put in a stuffed toy and couldn't find a decent option for a good price so I made a box for a regular old, tiny breadboard button that made it a bit more substantial.

Cut 2 legs off the button and solder on wires through the hole. Then slide on the "lid" and it should snap into place. You may need to depress the button with something like an x-acto knife to give the lid some clearance.