What is this Blade Chroma 4k Worth?

Hi all,

I purchased my Blade Chroma 11th January 2017 from Maplins. A couple of years ago I purchased a DJI Mavic 2 Pro and since, haven't used my Chroma so I'm thinking I might just as well sell it but have no idea what to advertise it for!

I've always maintained the batteries by charging, discharging and balance charging on a regular basis so all is in perfect condition, never crashed and completely unmarked - ready to fly

Can you guys give me some idea what I could expect to get for it or what to advertise it for - I did try posting in Marketplace but couldn't see an option to create a new post!

I'm located in Bridgend, South Wales, UK

Apologies if I've contravened any rules - certainly not intended

I can of course show the drone flying.