Change coolant air conditioning. How is it current market price?

Moin, The air conditioning of our old Roomster (BJ 2007) did not cool any more. It came only a whistle and lukewarm air. So my wife is in the workshop at the corner and had the coolant replaced once. Cost point 160,- EUR. What I find quite a lot. Even if the plant was completely empty. Only last year we had the remedy filled up. In another workshop. We paid there 50,- EUR. Probably he only refilled and refilled there. Unfortunately, he has planned today to check whether the plant has a leak. So next week again. Workshop argues with the massively increased prices for the coolant. Is that so? I would have arranged it differently, but the woman is simply steamed out without getting any more offers.