My heater core just went on my truck with 144k miles. After reading the different threads on getting at it to replace - seems the whole dash has to come out. WONDERFUL! Not something I want to do at this time - especially since I don't have a garage. What would a fair estimated price be to getting this replaced at a shop? I just want to make sure I don't get ripped off while I'm shopping around for a shop to do the job. Thanks.