The Blues are the only hockey show in town tonight. NBCSN's got the broadcast - the pre-game and live stream begins at 6:00 Central.
If you won't be at home, head to NBC Live Extra's website to catch the game, or use the app on your smartphone or tablet. Not sure about blackout rules in St. Louis, but I'd assume that you should be able to get it fine. I've seen stuff here and there on social media about in-market blackout concerns, but I'm not sure why.
Radio will be on Y98 tonight due to the Cards/Angels game. Adjust your dials accordingly.