http://www.herpsupplies.com/images/P...Clear_F150.jpg
retails around 12 dollars

you can put a water bowl in the soil

i personally dont like that setup because of the mess, and like i said they will spend most of their time IN the bowl and not use the rest of the terrarium, this also means you will have to constantly clean the bowl and put fresh water in it, but it is up to you