[Suteisi]

Well really, it's up to you. Some people prefer YesAsia, some others CDJapan. I think those two websites are the best places to get authentic singles, cds and dvds without fearing of getting bootlegs. But, they can get expensive too. I personally prefer CDJapan. The shipping is really fast, and the items always arrive in good conditions. I've heard of some people saying the same thing with YesAsia, but others also said some of their CDs came in cracked from the same website.

Also. If you decide to buy from other websites(such as eBay for example), when you see a DVD or CD that's sold for 10$ or less, you should be concerned. Is the item in good condition? Is it used or brand new? Is it fake or not? I've been caught before, the DVD look real like the ones sold on CDJapan, and I got it for super cheap, but when I received it, it was a bootleg.

As for MUST HAVE. Well, I thought that Arena Tour 06 was the best she's done so far. And I just watched AT07 also, and really really loved it! Especially with all the backstage and special documentary.