There are dried and refrigerated ones. This noodle cooks VERY quick. Fresh one is stored in the refrigerating section (not frozen) and dried one is usually along other noodles on a regular aisle. Obviously, dried noodles need to be cooked longer.
This is the same noodle used for Pho. There are many different kinds of rice stick noodles too so if you can find this specific brand. That will be great since I like this noodle the best.
Rice Noodle related items on ebay: