If you will have a car (or are willing to take a taxi), you could order Will Call tickets from undercovertourist.com. I recently read their FAQs about this method of getting tickets, and it's at a UPS Store near Universal.
If you're sure you're going, I would order in advance either from Disney (choose will call and you will get a confirmation number you can use to book FPs in MDE) or from Undercover Tourist and have them mailed to you at home.
If you haven't gone yet and are staying off site you can book FPP 30 days in advance so worth getting them early. You have to create a My Disney Experience account, link your tickets then you're good to go. So you heed real tickets not vouchers for this to work. Undercover Tourist send real tickets.
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