Help,Where can I buy the software which called "x-plane" in the US

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I can introduce myself first.I'm a Chinese student.So forgive me if I get some grammer mistake or sth. like that. I'm an high shool student in Shenzhen. In summer holiday I will come to the US if I can pass the Visa. I was joined the study tours and during that time I will study in Lock Haven University for about five days. I want to buy a software or a game called "x-plane". Could someone tell me the store name or address near the universityor in that city? I'm appreciate for you if you can help me. And thanks you for reading this full of mistakes' discussion. If there are some impolite sentences.I hope you can forgive me. Because I don't know exactly the styles in the US. But I look forward to studying the culture in your country.