GameFly has a bundle of Spec Ops: The Line and The Darkness II on sale for just $4.99. You can then use the coupon code GFDAPR20 to save another 20% off bringing the price down to just $3.99.

Both games individually are selling for $29.99 each elsewhere. Both of these games are Steam activatable, just look for the keys under your order history.

They also have a Bioshock 1 & 2 bundle for $4.99 as well, which you can bring down to $3.99 with the coupon. These games are not Steam redeemable however.

Note: All games are digital downloads only and prices are in US dollars (and exclude tax).