Dark Souls: Prepare to Die Edition is on discount sale on Steam today, as part of the Steam Autumn Sale 2013. The game can be purchased for $5.99. (Normally $29.99)
Also available at a discount are XCOM: Enemy Unknown (down from $39.99 to $9.99) and Final Fantasy VII (down from $11.99 to $3.99).
Finally, as part of the “flash sales”—which are updated every 8 hours—Skullgirls is available for $7.49 (down from $14.99) and System Shock 2 is available for $2.49 (down from $9.99).
You can find all of today’s Steam deals here.