I'm looking to find a pair of 130mm brakes for last year's Marker Baron/Jester/Duke/Griffon in any condition. I'm guessing a lot of others are as well, but worth a shot. $50 seems like a silly price for brakes.
I've got two pairs of the 110mm brakes to trade as well as a whole basement filled with ski, climb and road biking gear (or $$$). If you've got an extra pair – holler!