SPI to SCI

[paqman]

I've been looking all over the internet and have yet to find an answer. I'm building a final project for my Robotics Program and need to interface a bunch of sensors, which include GPS and a machine vision camera (another microcontroller). The camera and every GPS on the market which we can order only have SCI output, and the microcontroller we'd like to use as the main brain only has 1 USB input (but it has SPI of course).

Is there any way we could convert SCI to SPI? Or is the best solution to buy another microcontroller with 2 serial ports?