bought my first bike, which is a '78 CB750A.  $200. Not quite a basket case, but a non-runner.  Mechanicals are all there, seem in good shape and intact.  lots of parts in a box.  Sportster/peanut tank installed with a seat pan.
I figure wrench and learn over the upcoming winter, run this one after my saftey course, add a standard transmission CB750 in the summertime.
almost fifty years old and riding has always been on my bucket list.  Divorced the old lady I shoulda left 5 years ago, and now it's time.
Glad I found this site!