Square Enix are running a Tomb Raider-themed PC promotion. You can currently get Lara Croft and the Temple Of Osiris and the Tomb Raider reboot for £9.99 on the Square Enix Store.
You can read our Lara Croft & The Temple Of Osiris review and Tomb Raider review for all the details. We've seen both games for less during limited-time GMG sales, but this cheap PC bundle is a very good price indeed especially seeing as you'll get Steam keys.