soft warm socks and gloves. make a fleece blanket themed with something he loves. You lose body fat and don't move much, so cold can be an issue, even if you're in a warm climate

I can get him USB powered gloves!
Well mittens really...

I've determined he wants cheesecake...I could get him a gift card to Cheesecake Factory...but I'm gonna look for a way to get it delivered to his door.

Look up a local store, call them and explain the situation. they'll deliver.

Get him a CD or a kool LED flashlite, don't remind him he has cancer he already knows. :)

laser pointer and a kitten

Scalpwax?