Diffuser , what's it worth?

I have the carbon fibre diffuser on the M3, what's the original
Worth second hand. No idea how much it's worth, if anything.

€60-€80 in good condition

Its probably worth about 0 imo!!

Have advertised mine a few times for free and have had no takers.

It's really a timing thing I'd say, hard part to find when looking for one bit how often does someone need one.