Radiant Floor Install

Hello all, I am in the process of getting my hot water boiler replaced and asked for quotes on getting radiant floor (PEX) installed under my kitchen floor. Install would be in the crawl, between the rafters. Square footage for the coverage is about 120 sq ft. How much would you think it would cost to get the radiant flooring installed? The two contractors I am talking to are quoting $1,000 to do it and I think that is really high...thoughts?