Honestly, I think sunglasses are worth spending money on. I always used to rock cheap shades and they would break or get scratched, blah blah blah, but I got a pair of polarized Ray-Bans and I've had them for around a year and a half, in perfect shape, and the lenses are soooo much better than a cheap pair. Just save some money and invest it in a pair of good ones instead of five pairs of shitty ones.