There are at least two other companies who sell the wing I think your referring to. Its the one that almost looks like a touring car wing that dips down at the ends. They pop up on yahoo.co.jp every now and then for no more then $180.
No they aren't replicas as SYMS is not the only shop in the world who makes a wing in that style. You can get any style of wing from multiple companies. Unless you want to pay the extra amount to tell everyone its a SYMS wing. I'd rather spend the extra on something else.