Purchase any game on GOG.com through October 17 and receive Geralt of Rivia's first adventure at no extra cost. Yup, you can buy anything and get The Witcher gratis. Of course, GOG has an extensive selection of classics, but there's also super fresh games like Knock-Knock for $8.

Also on sale over the weekend is Divinity: Dragon Commander, 40 percent off for interested mega-reptile leaders. The turn-based overworld RPG meets real-time strategy battle game is $23.99 for the standard game and $26.99 for the Imperial Edition. Be warned, the game is unapologetically hardcore.