Member in need auction/sale

the bids are seperate, but in a mass bid you don't get duplicates.I had them set aside for each bidder today and I believe there are four diffrent dusters to get including "cop out" and as of so far there is two bidders both at 75$ for the four of em so first bidder will get em or raise the bid? I'm new to running a charity auction and forgive me if I am not perfect but that's seems the fair way to go???? let me know if I'm wrong..... wow this ain't easy......but ya'lll let me know the proper way to do this if i'm screwin it up.