Depends on the day and if you buy at the station or online and if you buy online if you use a travel website or if you just buy from the site. At the station is the most expensive. Their website is the next most expensive. Travel websites like Travelocity and Kayak are where you can find the best deal. Also, if you buy one for, say, tomorrow it may be more expensive then buying one like 3 months out. Hope this helps.
That and, the stations are permanently closed due to the coming apocalypse so you cannot physically buy a ticket at the station anymore you have to buy it online
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