So in case anyone is thinking about holiday presents, I got a converter at Best Buy for about $80 the other day. It's great! It comes with a holder for slides, a holder for negatives, and a scanner. I tried it out, and the resolution on a negative from 1992 was surprisingly good.
It's going to be a long project for me to digitize all of the negatives and slides, but it will be nice to have archived them before they further degrade.