Just because you’ve got a set of tempo miles on the schedule for this afternoon and a half marathon coming up in two weeks doesn’t mean you can’t run in cheap Nike women’s running shoes. The performance-minded Flex 2018 RN is like a budget running shoe unicorn: despite its ridiculously low price, it comes in at a featherweight 6.2 ounces in women’s size 8, it’s heel-toe drop of 7 mm is edging toward the aggressive side, and its mesh and Flywire upper provides the same secure fit and race-day lockdown feel as models that are nearly twice as expensive.