Virtual Exchanges via Amazon offers Prime members select Fila Men's Sunglasses
with free shipping
. (Non-members can get free shipping with orders of $25 or more; otherwise, shipping adds $5.48.) Many models are at or near the lowest total price we could find.
A best bet is the Fila Men's Polarized Sunglasses, model no. SF005P, for $18.99 with free shipping for Prime members. (The same non-member shipping options from above apply.) That's the lowest total price we could find by $9.