[Item Estimate] Unbreaking III Power III Bow

Hi y'all, It's me, t6ler again asking the community for some help with finding the right starting bid for two enchanted bows. I'm not the greatest (In fact I'm terrible) at finding a good starting price for items that I would want to auction. So earlier this week, I managed to get my hands on two bows of the same enchantment from skeleton drops, and since I have no use for them, I would like to auction them off.

Down to the question; What is a good starting price for just ONE Power 3 Unbreaking 3 bow?
Any advice would be appreciated