Check your credit card terms; several issuers have a program that lets you spread out a large transaction repayment over a period of several months. You pay a flat monthly fee instead of interest on the purchase for as long as it's carried back, which if the interest rate on your card is high, usually works out to less than the interest would be on a purchase this size.
We're OOS AP holders, and have 3 APs that come due at the same time. This is how I pay them. (I don't split it in 12; usually 6, but it's helpful.)