For starting goalies, the Leafs could target
John Gibson,
Ville Husso,
Darcy Kuemper,
Semyon Varlamov, or aim to bring back Jack Campbell. Of these options, all are UFAs aside from John Gibson, where it's recently been made clear that Gibson would accept a trade out of Anaheim. Also of the highest pedigree however, Gibson comes with a salary of $6.2M annually, and would be costly to acquire in trade. The rest of the options would only command $4-5M in free agency, and the one million dollar difference would be massive with the Leafs' tightly against the salary cap.