Areatrend via eBay offers the Ray-Ban Men's Justin Sunglasses in Black/Gray, model no. RB4165, for $62.66 with free shipping. That's the lowest total price we could find by $27, excluding the mention below. They feature UVA and UVB protection and a lens width of 54mm.

A close price: Amazon has them in Gray Gradient for $64.51 with free shipping.