After two games at Dodgers Stadium, with the series tied 1-1, the games move to Petco Park on Tuesday and Wednesday for games 3 and 4 of the NLDS. According to the Padres website, the ticket sales are limited to areas close to San Diego.
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Ticket sales to the postseason games are available to Padres Insiders and people living in the following areas: San Diego County, Baja California, Imperial County, Southern Orange County (San Clemente, Dana Point, Laguna Niguel, San Juan Capistrano, Laguna Beach), Southern Riverside County (Temecula, Murrieta, Lake Elsinore, Menifee, Hemet, Perris), La Paz County, Mohave County, Yuma County and Clark County.
The website says sales to people outside the geo-limited areas will be "canceled without notice and refunds given."
If the series makes it to Game 5, it will be played at Dodger Stadium, which could cost about $150.