Join the free dating site ok cupid. My advice, don't join as a couple. If you, yourself, want a gf, write your profile reflecting that. Answer their Q&As to reflect you are polyamorous.
If your h also wants a gf, he can write a profile and search for a gf for himself.
If you've got the idea, as so many new poly people do, that you and your h can share a gf, think again. Read up here. Do a tag search for "triad," "unicorn," "secondary," and learn about the pitfalls of trying to "share" a woman.
Just a warning from someone who was also a unicorn hunter once upon a time.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
Mags (poly, F, 61) loving miss pixi (poly, F, 39) since January 2009, living together since 2013
"Master," (mono, 36), miss pixi's Dom for 3 years