Kind of a broad question, OP...
Do you have frames that you like? If so, take a look at Revant Optics and look at getting a set of their replacement lenses for those frames. I have a pair of their brand sunglasses and am very happy with them. They're the ones I wear when I do any kind of outdoor activity and the clarity and contrast (red lenses) is awesome. I have a pair of Ray Bans in my car that have scratched up lenses that I've thought about getting a set of Revant lenses to put in them since the frames are still in great condition.
A cheaper option that maybe you want to try is Shady Rays. I bought my wife a couple pair for something last year and they emailed me a coupon few weeks later and I picked myself up a pair just because, and they are actually really good. They have replaced my scratched up Ray Bans in my car for the time being. They have 3 different tiers of lenses, and I got the Pro Polarized, which looking on their site, they currently have for half off on a Memorial Day sale, so ~$40 for most. May be worth a shot. I've been very happy with them even though they're the cheapest sunglasses I've bought in years. Come to think of it, my daughter's sunglasses he wears when she plays softball are getting pretty beat up, so I may grab her a pair for our upcoming summer schedule.
https://www.revantoptics.com/https://shadyrays.com/