How much should I pay for 2nd hand Opera Quinta SE

Dear friends. I'm going to upgrade my set up. I’ve been offered a very nice pair of the Italian manufacturer Opera, Quinta SE in mint condition. Been told that they are 2-3 years old. I’ve listened to them and the sounds are quite good and accurate.

in you opinion, how much I should pay for them?
Many thanks in advance for any comment or answer.