I was able to find the sheets that I needed, but it took awhile because I couldn't find anyone to help me. When I did, the employee seemed to know what he was talking about, but really couldn't recommend any brand or style based on my expressed needs.
The store is junky. There are a ton of products (a nice feature), but it feels much more like a warehouse (an old Wal*Mart or Winco) than a store. I guess if you know exactly what you want, this would be a good place to go.