I purchased a L4D2 server for three months. It's New York-based (they were out of Toronto servers) so you should get <100 pings on it. If you are having any problems, just let me know. You can connect to the server by selecting it from your 'Steam Group Servers' in the menu, or by using the search key "Farmrush".

In case you don't know how to do this: You need to first enable the developer console in your options. I believe it is under the advanced keyboard settings, but you might need to search around. After that, join a game and press the tilde [~] key. This will bring up the developer console. Then type "sv_search_key Farmrush". Exit the game and start a lobby. Now when you search for a server it will automatically connect to this one provided it is empty.