50-60% off what retail price? From sites like Sak's/Mr. Porter they seem to run at around ~480ish while from Oki-ni and Tresbien, they seem to run at around $300-330. (I think US residents can get them from Tres-bien for $298 shipped, not including discount codes).
I'm looking for a white pair in 43 and I'm not sure what would be a "good" price for a new pair.