I had an AC issue and was quoted a $2000-$2500 fix. This was during the summer of 2013 in Las Vegas, NV in approximately 105 degrees Fahrenheit weather. I'm not a car expert but I also not a car idiot. I've always had a clear idea of what my issue was and was low refrigerant and AC compressor issue where cold air isn't coming out. Somehow I got a quote that's not worth my time for a repair since I can get a used car for that price. After declining to do job so that I can think over longer, the price for AC checkup went up to regular price vs my coupon price. ($14.99 instead of $9.99) I didn't say anything because my car was still connected to the machine and was weary if they might do something shady.
Note: During my time waiting, there was an mother and her children trying to go home that came in complaining about paying a big job for the AC fix that didn't work. (Probably $2500) This was one reason for my skepticism.
After finishing my Vegas trip where I drove my car, I eventually had to explain my problem with the dealer. (Toyota) All I needed was a AC recharge and a new AC compressor since the previous one was consistently clicking. Job was finish in one day for under $250.
Be careful of up sells and don't make a rash decision if doesn't feel right. (Example: Blackjack, hit on 20 with a 6 showing.)
Note: I finished my Vegas trip with no AC. Harsh reality check of how lucky we are that someone invented AC especially in a car operating in hot weather.