Another alternative is to find someone at your level and share a couch. You will probably be looking at $50 per hour for 2 persons which you can share the cost.
It depends on the coach's level on how much is charged. The higher the rank, the more they charge. I took lessons at C1 with a friend and it was $67/hr. So about $34 each between 2 people. More people in the group, the cheaper it gets. Problem is that you don't get personalized attention/sessions.