Check out camping and hiking gear but especially if you can find a store that carrier gear for kayaking and canoeing. I'm a whitewater paddler and we always look for clothes that will wick water away and dry quickly. Most of what I have is made by Patagonia.
Try LL Bean - just do a search for coolmax and you will get a list of their coolmax products. We are lucky to have a bean outlet and today I saw ladies coolmax shirts for $10.