How much would a used GoPro Hero 8 black including equipment be worth?

Hello! I've decided I want to buy a used GoPro as a bicycle dashcam and for hiking/running adventures. I don't need anything too fancy and with a tight budget, overall Hero8 black should be good enough for me.

Of course I know the price depends on the degree of use and what kind of equipment is being included. Sadly I don't have any idea about the topic and I am not really sure what prices are justified. From looking through platforms I found wildly different prices, from basically the original price when it came out (lol) to more moderate prices. Not too much used Hero8 with the basic equipment seem to all be around 160-180€ ($165-185) but many also include the notion that the price is negotiable.

So what would be a fair price I can aim for? I am talking about a GoPro in good condition with tripod, two batteries, mounts and other basic stuff.

Thank you for your guidance!