If its at the rear its likely to be suspension fluid. Keep an eye on your
fluid level see how fast it goes down, it may only leak fluid as the car
settles after parking but you need to get it checked out the last thing you
need is sudden loss of fluid as the car will be undrivable.
Can't help with the price though, perhaps others will.
It's hard to tell how expensive this will be, but it might be just the
rubber boot or aome thing after this boot in the back circuit to the
reservoir. In this case it should not be too expensive. Go and check it
soon, if it is the high pressure part of the system it might get worse fast
and you get stranded, the same goes for the fluid level, do not let it get
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