That's way too expensive for private sale unless they have been replaced with new in recent years. I bought pair of front shocks and springs from A8 parts couple of years ago for £80 and even got free postage on promotion. The prices have gone up since but you can still get pair for under £100 from them.
The demand for parts is very low with more and more D2's going off road, I had offer from private seller earlier in the year whole front and rear set for £80 because he had them for ages and there was just no demand.
It will be easier to sell as pairs of front and rear and you should aim no higher then £80 for the pair (unless like I said before they have been replaced with new parts in recent years).
Or just keep them as spares or to put back on car when you sell it.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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