Deal from cmkrzak22 yesterday;
"Please use the code GMG30-DPLIM-DN831 at checkout for an extra 30% off today's deal of 50% off Borderlands 2, bringing the regularly $59.99 down to $21 even.
Next best price has been Steam and Amazon at $29.99 in the past week."
The same code can be applied to todays deal for XCOM: Enemy Unknown. The 50% sale + 30% digital discount code, brings the total to $17.49.
Code also works on Slingshot content pack. 50% sale + 30% digital discount code brings the DLC to under $5.