Haven't played a BioShock game before? Now is a pretty cost-effective time to jump in and see what Ken Levine's acclaimed shooter franchise is all about. Microsoft's latest set of deals for Xbox Live Gold subscribers includes hefty markdowns on the entire BioShock series.

　　Now through July 21, the original BioShock (2007) and its sequel BioShock 2 (2010) are on sale for $5 each. In addition, last year's BioShock Infinite can currently be had for $12.89, meaning you can buy every game in the series right now for less than $23. Further, the two episodes in BioShock Infinite's Burial at Sea campaign, as well as the Clash in the Clouds and Columbia's Finest DLC, are on sale.

　　In addition to sales around the BioShock series, Microsoft's Deals with Gold promotion this week includes markdowns on various Quake and Doom games, as well as a pair of Xbox One titles. You can see a full roundup of the week's deals below. And if you need an Xbox Live Gold subscription, your sweet tooth could actually help you out.

　　Deals marked with an asterisk are available for Xbox Live Silver and Gold members, but do not go into effect until July 17.

Xbox One

Xbox 360