I'm actually super paranoid and usually only pay in cash, and I despise credit cards I have one but that's only to get a credit rating.
Paypal is quite secure (albeit a company that likes to screw their customers). You could probably e-mail UNC and ask if they accept credit cards. IIRC there is almost no way of knowing if it's a prepaid credit card or not, anywhere that accepts credit cards will automatically accept prepaid CC's.
Otherwise you could probably create a new paypal account (not sure if that's against the TOS though) and link your prepaid credit card to Paypal and pay that way.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE