Hunter x Hunter - episode 57 - 16 Feb, 2001

Leorio helps Gon to buy a complete catalogue to find Greed Island game there. To collect 8.9 billion they go to a flea market and use gyo to buy only items that have Nen aura on them. They make some money and befriend Zepile, a professional seller. Now they have money to pay for information, and Leorio calls them to tell that two Phantom Troupe members are located in the city. (Source: Wikipedia) Yorknew City arc/Phantom Troupe arc: (13/26)