My husband and his girlfriend and I have gotten counseling from my minister. I go to a Unitarian Universalist church, which is very liberal and open-minded. It's also a lot cheaper to go to a minister than a psychologist.
She (minister) has been very helpful to us. She's clearly done a lot of reading on polyamory, and she has a lot of skill in relationship counseling. Though there's lots of different ways to do polyamory, and I think she only understands one. She keeps saying that secondaries are there to support the primary relationship, which I'm not even sure what that means, and she seemed honestly confused that I didn't break up with my boyfriend as soon as my husband had serious jealousy issues. She asked me if I could get my social needs meet through activities at church instead of seeing my boyfriend, which I thought was a bizarre question and had no answer. Though once she realized my husband never had any intention of asking me to break up with him she dropped that whole line of thought. Overall though she's been immensely helpful and really helped us repair the relationships between the three of us.