If you've a sewing machine don't forget those turban styles are often very popular. There are 100% cotton yarns but not being in the US I am loathe to recommend as some of the yarns you folk discuss are not obviously available here and perhaps vice versa.
I've found if I ring stores that are at distance and talk to the staff about what I need and softness etc they are generally very good in giving me great recommendations. I live in a country area and my local shop has a quite limited supply BUT they do have yarn books with examples of threads from many varieties they don't stock. I've sometimes looked at that and then ordered long distance something I found I wanted.