Green Man Gaming takes 75% off Steam downloads of Half-Life 2 and its Episodes for Windows, Mac, and Linux, as listed below. Plus, coupon code "GMGSUM-MERSAL-E20OFF" cuts an extra 20% off. The deals, with prices after coupon:

• Half-Life 2: Episode One for PC/Mac/Linux $1.60 (low by $6)
• Half-Life 2: Episode Two for PC/Mac/Linux $1.60 (low by $6)
• Half-Life 2 for PC/Mac/Linux $2 (low by $8)