They´re called: Coin pushers.
Maybe somebody had seen it in those places that have lots of this kind of machines that give prices.
So, as there is nothing of this tipe in instructables, I´ve decided to make one.
Step 1: Materials
Materials you will need:
-Balsa wood (Is very easy to manipulate, they sell it in hobby stores, is used to make RC planes and all that...)
-One servo (you´ll have to modificate it so it will continue arround and arround.)
-5 volt adapter
-Double face tape
-All kind of tools such as a saw, screwdrivers, etc.
I used a dremmel too, but is optional.
-And of course, coins.