What's wrong with cookie sheets? If you get some nice aquarium stone to put in them they look better than the black or green plastic trays you see for sale. They are much cheaper too! The only problem I have with them is sneaking them out of the kitchen cabinet without my wife seeing.
Sheryl, I find the oncidium intergenerics can grow just fine in low humidity. You just need to keep the plant well watered. They do tend to get rather large though.
Bill
