I use Goodr. They are popular in the running community. Cheap enough that I don't worry too much about damaging or losing them. I don't think they have a UV rating, but are polarised. In saying that I don't wear sunglasses that often. They have a distributor in NZ: https://goodr.co.nz/ and they have 15-20% off sales once or twice a year.
Another one popular with biking/runners is Tifosi, but I find their polarised models here are closer to $100.