http://amzn.com/B005VANQ78 Less than $10 You need communication to be able to sync targets. Even brute numbers aren't going to get you anywhere if the opponent is organized and we aren't. Here's the tough love, they are taking it rather easy on us, it won't last forever. Please, for the love of God, get a mic and get in vent.
For those who have extra ear buds or even head phones laying around, you can use those just like a mic. Even speakers can be used as a mic if you do change them a bit. google is your friend.