eBay. Purchased new in box Pro carbon 2012 model from legit brick and mortar store for $170.
I'm in the same boat. Been looking for some Pro or S-works MTB shoes in a size 45.5 for what seem like forever. Everything I've come across is in all sizes but what I need. Will just have to keep looking over the winter.
I bought a pair of Comps in size 43 off the Specialized site when they were closing them out. Wore them a handful of times, injured my ankle, switched to flats, will never war them again. I'll let them go if they fit you. A little dirty but otherwise still new.
Chasing bears through the woods drunk with a dull hatchet is strongly not advised