Anyone know where to find some duets? My hubby agreed to sing with me (he has a lovely singing voice) so i can try to learn to harmonize. Any suggestions on where to find some sheet music or something to help us out?

In classsic music there many, many duets but if you are beginning they will be difficult at least.

If you prefer Musicals, there are a few in well known musicals like The Phantom of the Opera. Try for example "All I ask of you". Not too difficult.
Roles are: Raoul (baritone) and Christine (Soprano).

Each role sings their parts and there is a final part where both sing together. It's a good exercise. If you or your husband cannot play the piano for accompaniment, you will need a recorded track (without voices) for this purpose.

Angel of Music also has parts for Christine and Phantom (baritone/bass) and "The phantom of the Opera, with three roles /Christ, Raoul and Phant.)

Keep posting your decision and results!