I try to get most of my stuff used from online marketplaces like Craigslist or Kijiji. One problem I have with trying to make offers is that I have to decide how much a certain item is worth to me. I feel pretty lost here. I might know how much other people are charging for similar items (its market value) but what does that have to do with how much something is worth to me? For example, Champagne certainly isn’t worth its market price to me.