$50 to ship 180kg? Hell no, that's super cheap.
In America, that would cost hundreds of dollars (using the postal service, at any rate). Not sure about a freight shipping service, but I can guarantee that freight shipping in the US won't deliver it in 1-2 days like pretty much every shipping service in Japan.
Of course, if you were trying to have a package of this size delivered outside of Japan, I shudder to think what it would cost.
BTW, the Famitsu bid hasn't changed since yesterday, but as I predicted, the Gamest auction is on the move and is now at around $470 with 4 days left to go.