Through a mate that import straight from Japan's distributor (all prices quote are in YEN). You're simple ditching a bigger middleman (e.g. RHD, Nengun etc, maybe paying 30-50% mark up?) and paying a smaller middleman going my way (maybe 10-20% markup?).
If you're overly concern about warranty, just get them locally. Just gotta manage your risk and if you think its not worth it, pay that extra and get them locally. Obivously I think otherwise.