The ones you saw should be bootlegs. You can get those at Asian supermarkets for $5. I'd be suspicious of anything that is priced super low....

Oh and you mean this?
http://cgi.ebay.com/UTADA-UNITED-2006-LIVE-TOUR-CONCERT-DVD-HIKARU-UTADA_W0QQitemZ380199376776QQcmdZViewItemQQptZUS_DVD_HD_DVD_Blu_ray?hash=item5885a61788

That's a bootleg for sure.

http://cgi.ebay.com/HIKARU-UTADA-United-2006-JPOP-J-POP-MUSIC-DVD-NEW_W0QQitemZ380200068236QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5885b0a48c#ht_2079wt_940

This one's also a bootleg....it doesnt say Toshiba EMI on it.

In general....I'd be suspicious of anything that's priced really low....if you want the real deal just buy it from any credible vendor (CDJapan, YesAsia, HMV, ect.) It's kinda pricy, but it's authentic. If you don't mind getting a bootleg (which is fine. I had an UU06 bootlege that I sold. Sorry I can't afford a $60 DVD) then you should try to get one. The quality is generally on par with the original. Or you could go over to JpopTsuki and download the DVD.