After you file

I finally found it/them - all the forms for free, and without creating a login or account.  This is a great source for old tax returns, either Federal or by the various states:  https://www.taxformfinder.org/

For example, when I need a California form, say, a Form 568: https://www.taxformfinder.org/california/form-568 then on the * RIGHT * side of the window where the form is, click on the drop-down menu to access prior years.  So great!  No fees, easy fill in PDF on your PC.  FINALLY!