I am guessing it would take me 4-6hrs to change out the LCA bushings on a 123 chassis. I know because I have done mine already.

Being self-employed in a trade it irks me a bit to see someone chipping away at a shop owner that quotes them a price. If you don't like it then do it yourself. I get the same kinda crap from Harry Homeowner when they don't like my labor rates. $500 seems fair to me. What happens when something breaks and the shop spends twice the quoted time on it? Chances are they eat some of it. Ask them if they will do the job straight-time. This may work for you or it may bite you when something breaks and they have 12 hours into it. You pays yo money and takes yo chances....
RT

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When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K