You guys are awesome! Thank you for the ideas. We haven't really tried a Nook or Kindle yet. He has an iPad, but has never liked reading on it. It sounds like we need to try something else.
We are flying and driving for several hours. My son can't read in the car because he gets carsick. I have a daughter and she has to have books too, so that's why we really need to consolidate.
I'll probably buy some and take some. We might visit the library too since we are visiting family. Thank you all so much!