Yes Nova products are expensive for what amounts to a few sheets of plastic glued together and a fish tank heater. See what you think to single tray processing at I use a large plastic bowl full of water with a fish tank heater in it. In this I stand my chemicals in large mouth bottles. The chemicals are kept at the right temperature and there is only 1 tray. It works, wear an apron though and put some old news papers on the floor for inevitable splashes and spills, with practice these will diminish. It,s great fun, good excercise and just think of all the money you will save. all the best from tightwad Bogey