If you missed GMG's discounts last week, you may have another chance to pick up a deal today and tomorrow:
Day 1: Up to 83% off selected titles from SEGA, 2K, Telltale and Square Enix (http://blog.playfire.com/2014/06/international-federation-of…)
Day 2: Up to 85% off selected titles from VALVE, WB Games, Rockstar, Codemasters, Microsoft
15% off voucher*:
ENCORE-IFDSAL-E15OFF
25% off voucher†:
https://freegame.greenmangaming.com/
*The 15% voucher expires at 4pm UTC on Sunday 15th June 2014. Voucher only valid against selected PC Download titles. Minimum spend of £/€/$5 required. Voucher is not redeemable against bundle or multi buy offers. Note that some titles will be excluded from vouchers. Multiple vouchers and GMG Credit cannot be used in conjunction. Voucher and titles available are susceptible to change.
†25% voucher expires at 15:00 UTC on Monday 16th June 2014 and is valid on a minimum basket value of $10/£10/10€. Voucher is locked to your account only and can only be used once. Voucher valid on selected PC download titles, certain titles may be excluded. GMG Credit or multiple vouchers cannot be used concurrently.
The new Thief is $15.31 after the 15% off voucher, not bad. I don't want to link my Steam account so I wasn't able to test the 25% one.