Bought my W124 rebuild at FastLane for $125...this was two years ago.

I also installed it myself. It's pretty much a DIY job. It's a bit tight for room to get at the mounting bolts, but deinstall took me about an hour.

Install was simpler...30 minutes including replacing the serpentine belt.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car