I went out right before New Years looking for the little disks for the Jiffy Greenhouse. Visted a local garden shop. It tooked them forever to find the disks in their store but in process I stumbled on an item that those there had not seen yet, a 72 cell Heated Jiffy Greenhouse. Their price was 39.99, so I bought going to give it a try, see how long the heating pad lasts , also there is no temp control .