Years ago I bought an AWD audi - guy had just paid something like 2500 bucks for a clutch job a few months prior... Rear main seal was leaking when i bought it.
Took it apart - idiots put the wrong $10 seal on the crank when they did the clutch - so I redid the "$2500" job. Took me a whole bloody weekend IIRC. (Of course I discovered the wrong seal once I took it out).
Most I've paid is maybe $300, forget on what now. I usually do my own work... figure I can take the day off work, do the car work, and come out ahead.
Body shops have got me for some big cash, but it was always insured, so I didn't have to pay.