this thread seemed the most appropriate for this...
i wish people wouldn't totally dismiss YesAsia. yes, their stuff is overpriced, but often time the free shipping can still make it cheaper! look at this..
CDJapan
YesAsia
Amazon.co.jp was a little cheaper than CDJapan (but only by like $5). i only checked them because i also want to get the special edition Ultra Smart PB, but i think Amazon doesn't count towards Oricon so i passed. HMV would have been cheaper without the shipping cost, but with it it was approx. $10 more (plus they don't have the UTB volume). it said i COULD get free shipping, but once i went to checkout it added the shipping cost anyway.. i guess i don't qualify or something.
i've also never had problems with damaged items from YesAsia, though i know other people have (and conversely, i've received a damaged CD from CDJapan while other people have had no problems). the point is that they can definitely be cheaper depending on what you are ordering, so it's worth checking!