Go to the mall, find a sunglasses stand. Try on polarized sunglasses until you find something you like under $12 or so.

You’ll find the brand/model number written somewhere on the frame. Google it, and find someplace to buy them by the case.

By a case of 10, put it in your drawer. Bonus points for getting it in another color (I have a set of white frame chunky glasses, but also the exact same model in black for fancy occasions).

Now you have sunglasses you can afford to lose constantly, a backup supply, and a signature look.