You can buy any number of Nike/Reebok/Adidas socks at your local sporting goods store that all wick the sweat away (check the fabric blends), and you can buy them in bulk packs and save a lot of money (and often not have silly graphics on them).

You can even choose the height you want, from no-show to slight rise to full rise above the ankle and more.

But yes, anything is better than a 100% cotton sock when doing any kind of activity that makes you sweat.