The former game is available for pre-order, whereas the latter has just appeared on the North American PlayStation Store.
PlayStation Plus subscribers have gotten used to getting many great titles for free via the special Instant Game Collection, but Sony continues to pamper its members with many other advantages.
These now include special discounts for new or upcoming titles, according to PS blog.
More specifically, PlayStation Plus users can now buy Metro: Last Light via the PS Store with a 20% discount and they can also pre-order Grid 2 and score a 10% discount.
While Metro: Last Light is out this week around the world, Grid 2 is set to appear at the end of the month all over the globe.