If you've already used the 25% gmg code for either xcom or dishonoured you can get a decent price here:
XCOM is £23.49 & Dishonoured is £24.99.
Makes me wish i'd got dishonoured through gmg instead of xcom now!
Fow those wary i've used them a couple of times and it's like gmg - you get a key to stick into steam. Not had any probs