Are any of these servers what you are looking for?

Servers with "GameArena" and "Alien" in the name:
GameArena Alien Swarm #01
GameArena Alien Swarm #04
GameArena Alien Swarm #02
GameArena Alien Swarm #07
GameArena Alien Swarm #08
GameArena Alien Swarm #05
GameArena Alien Swarm #03
GameArena Alien Swarm #06