There's a misconception that just because a company isn't huge like Nike or Adidas that they don't use slave labor, but don't get it twisted - lakai, es, emerica, all those brands use slave labor too - they simply would not be able to make a profit if they didn't, it's the beast of capitalism forcing people into more and more ethically fucked circumstances in order to compete and keep margins low. Not positive about Cariuma or Last Resort but I'm inclined to think they're none too great either. If you're really concerned with prices and ethics just hop on depop or mercari or ebay or whatever - plenty of barely "used" shoes at $40-50. Done this a bunch and it's been fine every time.