They are called Bobbin Genies and have been available for several years. I've seen them in the better quilt stores. By better I mean the shops that keep up with what's new and at least knows what you are asking for. One shop owner laughed in my face when I asked and explained what they were. I marched right back there the next day and handed her dozens of print outs from the best quilt shops that sold them. The reviews of quilters that used them, the endorsement of prize winning quilters that used them and a copy of my order form that I ordered over $250 of sewing notions, books, thread, precuts, and Bobbin Genies-- not from her store.