It will cost you more to make your own Jake Sully costume for your boys as shown here at Avatar Costumes .Good news is costumes shop already have in stock and ready to ship the Jake Sully outfit for your boys.
I believe this kid's Jake Sully costume will help all the parents save time and money since we are all pressed for it.
The image on your right match the exact kid's Jake Sully costume excluding the shoes. You'll save on the makeup too since mask comes with it.
But if your boys insist on having a makeup then you can watch this Avatar Makeup Tutorial video.
