Jennifer, what are the blue trays and where did you get them? They're not sleds are they? I have used up all my flats, all my styrofoam meat trays and anything else flat and sturdy I could find to put my paper pots on. We are almost finished with the last ( for now) plug tray, #13 (288 plugs). Next round will be next Thurs. but much less, only about for trays.