I agree, $3600 is expensive to replace an oil pan. I think I paid around $1000 to replace the oil pan on my old allroad when it was damaged by road debris.
I read somewhere that on the LR3 it's not just a metal pan. The 4.4 engine is built like a Jaguar racing engine where the oil pan is an integral part of the engine and supports the crankshaft.
Big repairs like this are when you decide if you want to keep it or trade it. I like our LR3 enough that I just put $3K in suspension parts into it including both front hubs (whining bearings) new control arms, tie rods, ball joints, bushings and more.
I guess it comes down to paying for repairs & maintenance on our LR3's or making car payments on a new vehicle. Either way we pay.