These are items we are using for the Green Screen station in our Maker Studio:
Green Screen by Do Ink App ($3)
iPad 2 tablets
iPOW iPad Tripod Mount
Tripod
Fancier Chromakey Green Screen Kit 1000 Watt Video Lighting Kit Photo Studio Kit Umbrella Softbox Kit ($140)
Do Ink Green Screen Basics
Check out Shelly's workshop curriculum on Green Screen videos. Also refer to Wesley Fryer's 2013-15 Green Screen page.