Welcome to the forum, Shari!
Nice find. $100 is OK - if you can sort out whatever needs doing yourself. It is not possible to do a proper assessment from small photos. If you have to take it to a professional and pay for it to be restored, your spending could soon soon exceed its resale value.
I can't see any major issues from the photos. If the condition is as good as it seems to be, I'd buy it - but $100 isn't a lot to me and I like fixing old and broken ukes.
Not much help, I know, but the best I can do.
John Colter