I don't know what wild hair got up your ass DJ, but Walmart treats their people like ****, and that's a good enough reason not to shop there.
I use the generic wicking stuff from the big box sporting goods stores for typical riding, and some better stuff like patagonia or underarmor too, but it's nice to have some classic wool cycling clothes around as well like people were saying above.
Sierra Trading Post has pretty good deals on the stuff.
Campagnolo Retro Wool Cycling Jersey - Short Sleeve (For Men and Women) -- $117
they also have modern cycling gear pretty cheap.
It pays to have a decent mix of gear, cycling specific and otherwise.