Again I know not appropriate for all, but I thought I would put down a couple more ideas I have had for Ds2 because they might help someone else out.
This MP3 player has a built-in speaker so it doesn't need headphones (which is good for us because DS2 refuses to wear them). The sound quality is pretty good and for our holiday this year I loaded a lot of audiobooks onto it and Ds2 loved it. It holds quite a lot - we managed about 20h of audio books.
On a similar note I am wondering about buying a digital voice recorder and recording myself and other members of the family reading stories for Ds2. It connects up with the computer so you can burn your recordings onto CDs or MP3. I also wondered if some autistic children would enjoy having it themselves and go round recording their own sounds to listen to?
Last one for now, someone might have suggested this but there are loads of lava lamps on ebay. Thought they looked quite fun.
Any more ideas from anyone please post, I have queues of relatives wanting ideas for Ds2 .