Max Payne 3, PC/Mac – £2.44
Max Payne 3, PC/Mac – £2.44
Available as either a Steam key or direct download.
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Registers on Steam.

Looks like the cheeky gits aren’t doing the discount for the steam version now. Still good on the direct download, though.
Actually… on closer inspection, you can select the ‘Mac Download – Steam DRM’ option and get the full discount. Presumably that just gives you a normal Steam copy which you can play on PC or Mac as you choose.