I read that Flippa is excelent for technology related domains. For example, ItMagazine.com was sold for $10,000 on Flippa by using the UltraPremium promotion package ($349). I've listened (and recommend) the Domains Sherpa video interview with the ItMagazine.com seller: domainsherpa.com/shane-bellone-itmagazine-interview.
In my personal experience, I've listed CheapHotelsTokyo.com 6 days ago (using the basic package $9) but I have no bids yet. It seems that Premium or Ultrapremium packages are necessary to get better exposure.