I've had good luck with Costco's merino wool socks. I haven't seen them at my local store for a while, but I've had mine for a few years now and wear them almost every day, and none of them have any real signs of wear.
Neither have my Darn Tough socks, but I lost them and figured I'd try the Costco variety, and I've had much better luck keeping track of them.
I know this is a common one but Darn Tough socks have outlasted adidas/Nike etc by a wide margin for me. Highly highly recommend them (but they are not cheap).
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