Ebay has many vintage 1980's style in mint or near mint condition for 70-80. I didnt look through all of them, but you could likely beat that price used.
IME the photochromatic Serenghetti lenses tend to be lighter, even in full sun when they change.
The maui jims are pricey but very nice glass and tend to be light.
I have a set of Revo's from 1993 that are heavy, but the best lens available at the time.