I think he's just in the wrong thread. Mentioning Play-Asia sounds like he wants to import a system. Not a great deal on the Arcade system as they are charging roughly $100USD more than what it retails for in japan. That price spike is because of a supposed high shipping charge for bulky items to them, even though Play-Asia is HQed in Hong Kong, China. Where the charges shouldnt be so drastic for a not so long delivery of stock.
Anyway OP I wouldnt go expecting sales on websites like Play-Asia. Those types of sites never change their hardware prices unless the system gets old enough where they know someone wont be foolish enough to pay their asking price.
As for the amazon suggestion. If you're in Japan then go for it. If not then you're most likely screwed, cause the japanese amazon will cater to Japan, and have sellers most likely only willing to sell in and around the immediate areas.