I got a link to CDJapan's top 100 best-seller products for 2010 in my email today.
The top 10 are as follows:
01. Versailles - Jubilee (Ltd ver) (album CD+DVD)
02. Arashi - Anniversary Tour 5.10 (DVD)
03. Ayumi Hamasaki - Rock 'n' Roll Circus (album CD+DVD)
04. Arashi - Boku no Miteiru Fukei (album 2CD)
05. V.A. - Final Fantasy XIII OST (Ltd ver) (album CD)
06. Utada Hikaru - Single Collection vol 2 (album 2CD)
07. Tohoshinki/DBSK - Best Selection 2010 (2CD+DVD)
08. KAT-TUN - Change UR World (Ltd ver) (single CD+DVD)
09. the GazettE - Shiver (Ltd ver) (single CD+DVD)
10. The Rolling Stones - Sticky Fingers (re-release) (mini-LP)
And coming further down the chart:
47. Ayumi Hamasaki - MOON/blossom (single CD+DVD)
[...]
65. Ayumi Hamasaki - L (single CD+DVD)
[...]
85. Ayumi Hamasaki - crossroad (single CD+DVD)
[...]
93. Ayumi Hamasaki - Arena Tour 2009 A -NEXT LEVEL- (DVD)
Here's the full chart for you to look at:
http://www.cdjapan.co.jp/offers/charts/2010_all.html proving Ayu has big pull over the international JPop world, having a whopping 5 products in their Top 100!! :3