Shops in Japan that support international shipping?

Want to buy a luxman or Accuphase preamp/amp. The price in Japan is much cheaper than here in USA. Wonder whether it is possible to do that other than fly to japan and carry them back...

There are two options:
1. Find the shop that supports international shipping
2. Use shipping agent like tenso or other service? Any recommendation? The package should be around 30kg...damn