hence unlikely to be found at Chicago Food Corp, which is Korean.
While Thai, Chinese, and Vietnamese grocery stores carry them due to the strong Chinese influence and popoulated in their culture.
Rice noodles are made with 'rice' flour, but look at the ingredient list on label, starch and other ingredients are sometimes added to give it a more 'al-dente' bite. This is a matter of personal preference, I prefer the pure 'rice' version, which has a chewy texture.
They harden when chilled, but softens with heat. You can freeze any leftovers, and thaw when needed. Of course, mind freezer burn if left frozen for too long.
The places listed in previous postings are sources that I frequent as well.
Good luck!!!