I live in MTV, and I have helped a neighbor who was going through chemo once last week (so roughly in similar situation from immunity pov, her family does not leave home for same reason), and would be happy to help you. Email in profile.

I stop by costco once every two weeks, and would not mind picking up some stuff for you.

Like another commenter mentioned, nextdoor is fairly decent for getting help, you can find highschoolers doing runs for their neighbors.

Small side note: it's kind of hard finding some staples - toilet paper, eggs, etc, so make sure you are aware of it.