Yeah that's over priced. I figure stuff that's 1-3 seasons old in really good shape is worth about 33% of MSRP. Older and/or more beat up the price goes down from there. Custom is a $500 board and cartels are $250 bindings, so max I'd pay for a set about two years old in good shape would be $250.
Since these are even a couple years older I'd probably pay no more than about $175-200 if everything's in GREAT shape.