GameFly cuts 75% off a selection of Telltale game downloads for Windows or Mac. (The discount is reflected on the product's page.) Even better, coupon code "APR25OFF" knocks an extra 25% off, with prices starting at 56 cents after discount. Note that some of these titles require a Steam client to play. A couple of best bets, with prices after coupon:

• Sam & Max Season One for PC for $5.62 (low by $1)
• Tales of Monkey Island for PC or Mac for $6.56 (pictured, low by $9)