Amazon offers the New Balance Men's 515 Casual Athletic Running Shoes in Grey/Blue for $48.44. Coupon code "GRNMON14" cuts it to $33.91. With free shipping, that's the lowest total price we could find in any color by $34. They're available in select sizes 8.5 to 18. Deal ends December 10.
Of note, they're also available in Navy/Orange, or Black/Red for $36.74 with the above mentioned coupon (a low by $31).