I bought a pair of Maui Jim Ka'anapali sunglasses about 2.5 years ago. At ~$260 a pair, they were by no means cheap, but the vision improvement, super light weight, not-wearing-them feel, and very importantly, how well and easily they fit inside my helemt, made it all worthwhile.
Well, having sat on them a few times, dropped them a few times, stepped on them a few times, and flexed them countless times getting them in my helmet, one of the temple pieces finally broke. I was thinking, oh crap, there goes another $260, but I thought I'd give MJ a call to see if they had any sort of warranty.
Sure enough, they do. Replacing the temple pieces will come out to $8.95 ('shipping and handling', hardware and labor are essentially free), and replacing the (weathered) lenses will cost $60, so... for $68.95 I'll have a brand new set of these (IMO) ultimate sunglesses