We used powdered D76 in class. The teacher mentioned that he is only able to get the powdered developers right now. I live on an island and apparently the homeland security measures now make it impossible to ship the liquids except via ground transport. And, there is no ground between us and the next city. I have not had a chance to research this yet, and am not sure if the typical mail order house will notice, because I do give a normal-looking Massachusetts zip. So, it might have to be D76.