The cheapest bear is $15 and a dr suit would be about $25. Sounds (there's diff ones and you can also record your own) are $5. Dd1 just had a party there.

What about something as simple as a helium balloon tied to his bed? Honestly, depending on what he's having done and the meds he's on, he might not be up for more than stories and DVDs. The hosp will have toys on the ward as well.

Maybe some brand new special pencils/crayons and a new coloring in book?