Tbh not alot at all mate.
The only people that would want it are people with a 172 monaco who have a damaged standard spoiler that need replacing, and didn't want to upgrade to the cup one.
You do not have access to the market Russ sold his in (those with standard clios) as monaco is not a colour in the standard range. I assume you are changing the spoiler (perhaps to a cup?), if I were you I would hang on to it until you sell the car. Besides, you will never get your money back on the investment in the cup spoiler anyway.
Sam