Is there a way to purchase movies/tv shows to download onto USB jump drive?

Is there a place to do this online? We are going away soon, and it will be a long drive. I was hoping to be able to put some tv shows and movies on a portable USB drive to bring with us for my son to watch on his portable DVD player (that has a USB port for jump drives), but it looks like on Amazon Prime you can only download onto a tablet or phone? Is there another site that will let you put it on a portable drive? Or is that just wishful thinking? lol

I could just buy some DVDs for him to watch, but I was really hoping to avoid the extra clutter in the car, along with having to change the DVD's along the way...

thanks!

Is there a way to purchase movies/tv shows to download onto USB jump drive?

If you have a tablet, I'd just download them from amazon prime. That's what we do and it works like a charm for our 2 year old. We frequently go on 3-6 hour car trips.