Until January 31st (2010), Telltale Games is offering the entire first season of Sam & Max for $4.95 USD.
Go Here To Get It
For five bucks you get 6 episodes of hilarious cartoon violence and witty dialog. If you've been reading this blog for any length of time you'll know that I've talked about Sam & Max before (here and here). That was back when I was subscribing to GameTap. I've since canceled my subscription, but I've still wanted to make sure I have these games. For this price, I couldn't say no. Also, they take PayPal.
I think that this falls under the no-brainer category of purchases. What are you waiting for?