Replacing rear window cost ?

So I had my car retinted and the "tinter" messed up my rear defroster. He said the lines peeled out with the old tint. Filing a claim with his company, I think is hopeless at this point. He did say he tried hot steamer, etc and it still peeled off. I live in Socal so I don't use the defroster that much, but I do like to have everything working in the car. So I'm thinking of getting the rear glass replaced, or should I just live with a broken defroster .. If I do replace it, does anyone know how much it'll cost ? I don't think repairing the defrost lines will work either because there are multiple long ones ..