If it is for displaying other than at home then look for photographers display equipment. They are called "backdrop stands". I have seen vendors at quilt shows that make and sell them. Most are for permanent installation in the home. You might also look in any large furniture store for the stand up racks. They are usually put at the end of the bed to hang the quilt over. Antique shops also have these.
If you want to put it permanently on the wall, then can go to the Home store and get wooden brackets and rods. I will try and search for the name of the company I have seen at the quilt shows.