A humidity dome and tray are very VERY inexpensive and very good to have, make sure to get a high dome. Seriously, I paid $5 for mine. You could use two clear plastic containers, one upside down on top of the other and make your own. That will allow you to control the humidity and temp more effectively. If you want to spend a little extra cash a seedling heating pad helps a lot but it's not necessary. A single fluorescent light (tube or low wattage CFL) will be needed but don't give them too much light or it will stunt growth. Hope that helps...