experience with making buttons

[cad321]

For the past number of years my team has handed out injection molded custom key tags made in our shop. Unfortunately they do not receive anywhere near the attention the buttons do and we are looking to make some ourselves. We pride ourselves in making as much as we can in house with as much of it as possible being done by the students. We are wondering if any other teams have had experience making buttons themselves and if so, what were the costs to do so such as initial cost for the equipment and how much does it cost to make a batch of say 100 buttons? Any suggestions or tips are greatly appreciated.