Marriage counseling advice needed

So after being married for 4 years, we have a beautiful 1.5 year old girl and another on the way in December. I found out this week that my husband has been cheating on me. He says it's just physical and doesn't mean anything. He completely broke my trust but I still love him. We want to look into to counseling but I don't even know where to start. We live paycheck to paycheck and don't have the extra money but saving our marriage is important to me. Anyone have any advice for affordable but good marriage counseling?

I would also love to hear some stories of what worked/didn't work for you in similar situations.

Tyia