Yeah it is 50 for NCIX to build it, or 75 if you want windows preinstalled and configured.
BUT, it's a slow process, I just had them "build" mine but it was already 5 business days after my order was processed and they didn't even start yet, approx 3-5 business days to build and test, and then shipping would of been another 2-3 business days.
I cancelled the build part, and had them ship me everything, was at my door 2 days later AND I put it together for free(first time) in about 2 hours.