So, Another Rockstar promo action - nuuvem.

If it helps: I bought it from Steam. Even that version comes with 2 keys for GFWL, one for GTA 4 and one for the addon. But about the Steam activation: I don't know. You'd better ask their support, they speak English too.

There's one on GMG as well - and the prices mysteriously turned to £ for me.

nuuvem is a brazilian store

sells max payne 2, bully and manhunt, at least two of them comes with a steam key

all the three games mentioned aren't available for purchase directly at the br steam store

gg steam

I don't think you get steamkeys for GTA IV from nuuvem